diff --git a/packages/studio/AGENTS.md b/packages/studio/AGENTS.md
index baa1c245c0..ed50e042b0 100644
--- a/packages/studio/AGENTS.md
+++ b/packages/studio/AGENTS.md
@@ -145,6 +145,9 @@ bun run --cwd packages/studio test:edit-accuracy -- --grid pr --filter '^resize-
 - CI runs the full grid in shards and `ratchet.mjs` gates the result against the
   base branch's `baseline.json`; its header states the rules. When cases newly
   pass, commit the `baseline.json` from the `edit-accuracy-gate` artifact.
+- Shards are packed by each case's seconds in `timings.json`. When the grid or case
+  costs change a lot, regenerate it with `test:edit-accuracy:timings` from the
+  `run1/results.json` files of a few merge-queue shard artifacts.
 
 ## Gates that will fail your PR
 
diff --git a/packages/studio/package.json b/packages/studio/package.json
index 758ffeae17..4b91b39c7f 100644
--- a/packages/studio/package.json
+++ b/packages/studio/package.json
@@ -76,6 +76,7 @@
     "typecheck": "tsc --noEmit",
     "test": "vitest run",
     "test:edit-accuracy": "bun tests/e2e/edit-accuracy/run.mjs",
+    "test:edit-accuracy:timings": "node tests/e2e/edit-accuracy/timings.mjs",
     "test:filmstrip-controls": "node tests/e2e/filmstrip-controls.mjs",
     "test:webmcp-edit-loop": "node tests/e2e/webmcp-edit-loop.mjs",
     "test:thumbnail-save": "node tests/e2e/thumbnail-save.mjs",
diff --git a/packages/studio/tests/e2e/edit-accuracy/grid.mjs b/packages/studio/tests/e2e/edit-accuracy/grid.mjs
index 78c07b7efe..7955eb260e 100644
--- a/packages/studio/tests/e2e/edit-accuracy/grid.mjs
+++ b/packages/studio/tests/e2e/edit-accuracy/grid.mjs
@@ -1,6 +1,6 @@
 // The edit accuracy grid: one flat-coloured element in a generated project, crossed with one gesture.
 // Projects are written to a tmp dir per case; nothing checked in is edited.
-import { mkdirSync, statSync, writeFileSync } from "node:fs";
+import { mkdirSync, readFileSync, statSync, writeFileSync } from "node:fs";
 import { createRequire } from "node:module";
 import { dirname, join } from "node:path";
 import { dragCases } from "./drags.mjs";
@@ -256,6 +256,24 @@ function subHtml(spec) {
 `;
 }
 
+const TIMINGS = JSON.parse(readFileSync(new URL("timings.json", import.meta.url), "utf8"));
+
+/**
+ * Shard `shard` of `shards`, packed longest first by each case's measured seconds (timings.json, from timings.mjs) so
+ * the shards finish together; a case with no timing counts as the slowest. Returned longest first.
+ */
+export function shardCases(cases, shard, shards, timings = TIMINGS) {
+  const unknown = Math.max(0, ...Object.values(timings));
+  const cost = (c) => timings[c.id] ?? unknown;
+  const bins = Array.from({ length: shards }, () => ({ cases: [], seconds: 0 }));
+  for (const c of [...cases].sort((a, b) => cost(b) - cost(a) || a.id.localeCompare(b.id))) {
+    const lightest = bins.reduce((min, bin) => (bin.seconds < min.seconds ? bin : min));
+    lightest.cases.push(c);
+    lightest.seconds += cost(c);
+  }
+  return bins[shard - 1].cases;
+}
+
 /** Writes the case's project into `dir` and returns the files a gesture may rewrite. */
 export function writeFixture(spec, dir) {
   mkdirSync(dir, { recursive: true });
diff --git a/packages/studio/tests/e2e/edit-accuracy/grid.test.mjs b/packages/studio/tests/e2e/edit-accuracy/grid.test.mjs
index 8a198eeac4..8af92845a4 100644
--- a/packages/studio/tests/e2e/edit-accuracy/grid.test.mjs
+++ b/packages/studio/tests/e2e/edit-accuracy/grid.test.mjs
@@ -2,7 +2,8 @@ import { mkdtempSync, readdirSync, readFileSync, rmSync } from "node:fs";
 import { tmpdir } from "node:os";
 import { join } from "node:path";
 import { describe, expect, it } from "vitest";
-import { FIXTURE_CDN, buildGrid, localAsset, writeFixture } from "./grid.mjs";
+import timings from "./timings.json" with { type: "json" };
+import { FIXTURE_CDN, buildGrid, localAsset, shardCases, writeFixture } from "./grid.mjs";
 
 function fixtureUrls(spec) {
   const dir = mkdtempSync(join(tmpdir(), "edit-bench-urls-"));
@@ -37,3 +38,36 @@ describe("grid size", () => {
     expect(buildGrid("pr")).toHaveLength(271);
   });
 });
+
+describe("shards", () => {
+  const seconds = (cases) => cases.reduce((sum, c) => sum + (timings[c.id] ?? 0), 0);
+
+  it.each([
+    ["full", 20],
+    ["pr", 5],
+  ])(
+    "put each %s case in one of %i shards, all within one case's time of each other",
+    (grid, shards) => {
+      const cases = buildGrid(grid);
+      const split = Array.from({ length: shards }, (_, i) => shardCases(cases, i + 1, shards));
+      expect(
+        split
+          .flat()
+          .map((c) => c.id)
+          .sort(),
+      ).toEqual(cases.map((c) => c.id).sort());
+      const times = split.map(seconds);
+      const slowestCase = Math.max(...cases.map((c) => timings[c.id] ?? 0));
+      expect(Math.max(...times) - Math.min(...times)).toBeLessThanOrEqual(slowestCase);
+    },
+  );
+
+  it("still run a case with no timing", () => {
+    const cases = buildGrid("pr");
+    const untimed = Object.fromEntries(
+      Object.entries(timings).filter(([id]) => id !== cases[0].id),
+    );
+    const split = [1, 2, 3].flatMap((i) => shardCases(cases, i, 3, untimed));
+    expect(split.filter((c) => c.id === cases[0].id)).toHaveLength(1);
+  });
+});
diff --git a/packages/studio/tests/e2e/edit-accuracy/run.mjs b/packages/studio/tests/e2e/edit-accuracy/run.mjs
index 1c5f37e531..d33c90e088 100644
--- a/packages/studio/tests/e2e/edit-accuracy/run.mjs
+++ b/packages/studio/tests/e2e/edit-accuracy/run.mjs
@@ -11,7 +11,7 @@ import { parseArgs } from "node:util";
 import { execSync, spawn } from "node:child_process";
 import puppeteer from "puppeteer-core";
 import { resolveHeadlessShellPath } from "../../../../engine/src/index.ts";
-import { buildGrid, writeFixture } from "./grid.mjs";
+import { buildGrid, shardCases, writeFixture } from "./grid.mjs";
 import { killServers, runCase, startServer, stopServer } from "./case.mjs";
 import { runSequence } from "./sequences.mjs";
 import { METRICS, SLOW_RUNNER, score, slowRunner, writeReport } from "./report.mjs";
@@ -37,7 +37,11 @@ const { values: opt } = parseArgs({
 });
 const [shard, shards] = opt.shard.split("/").map(Number);
 const filter = new RegExp(opt.filter);
-const cases = buildGrid(opt.grid).filter((c, i) => filter.test(c.id) && i % shards === shard - 1);
+const cases = shardCases(
+  buildGrid(opt.grid).filter((c) => filter.test(c.id)),
+  shard,
+  shards,
+);
 const runId = new Date().toISOString().replace(/[:.]/g, "-");
 const out = resolve(opt.out ?? join(HERE, "../evidence/edit-accuracy", runId));
 const chrome = resolveHeadlessShellPath();
diff --git a/packages/studio/tests/e2e/edit-accuracy/timings.json b/packages/studio/tests/e2e/edit-accuracy/timings.json
new file mode 100644
index 0000000000..9a9d8f1315
--- /dev/null
+++ b/packages/studio/tests/e2e/edit-accuracy/timings.json
@@ -0,0 +1,749 @@
+{
+  "crop-fromto-px-r0-root-z100-after": 21.9,
+  "crop-fromto-px-r0-root-z100-mid": 21.8,
+  "crop-fromto-px-r0-root-z100-on": 14.8,
+  "crop-fromto-px-r0-root-z50-after": 22,
+  "crop-fromto-px-r0-root-z50-mid": 18,
+  "crop-fromto-px-r0-root-z50-on": 24.2,
+  "crop-fromto-px-r30-root-z100-after": 14.7,
+  "crop-fromto-px-r30-root-z100-mid": 22.8,
+  "crop-fromto-px-r30-root-z100-on": 15.6,
+  "crop-fromto-px-r30-root-z50-after": 26.1,
+  "crop-fromto-px-r30-root-z50-mid": 25,
+  "crop-fromto-px-r30-root-z50-on": 20.3,
+  "crop-hold-px-r0-nested-z100": 25.4,
+  "crop-hold-px-r0-nested-z50": 18.5,
+  "crop-hold-px-r0-root-z100": 19,
+  "crop-hold-px-r0-root-z50": 19.4,
+  "crop-hold-px-r30-nested-z100": 25.7,
+  "crop-hold-px-r30-nested-z50": 19.5,
+  "crop-hold-px-r30-root-z100": 23,
+  "crop-hold-px-r30-root-z50": 19.7,
+  "crop-hold-xpercent-r0-nested-z100": 24.4,
+  "crop-hold-xpercent-r0-nested-z50": 19.1,
+  "crop-hold-xpercent-r0-root-z100": 19.5,
+  "crop-hold-xpercent-r0-root-z50": 19.7,
+  "crop-hold-xpercent-r30-nested-z100": 23.1,
+  "crop-hold-xpercent-r30-nested-z50": 19.4,
+  "crop-hold-xpercent-r30-root-z100": 18.4,
+  "crop-hold-xpercent-r30-root-z50": 19.1,
+  "crop-idle-px-r0-nested-z100": 24.9,
+  "crop-idle-px-r0-nested-z50": 19.9,
+  "crop-idle-px-r0-root-z100": 27.5,
+  "crop-idle-px-r0-root-z50": 23.1,
+  "crop-idle-px-r30-nested-z100": 28,
+  "crop-idle-px-r30-nested-z50": 21.3,
+  "crop-idle-px-r30-root-z100": 26.6,
+  "crop-idle-px-r30-root-z50": 23.5,
+  "crop-keys-px-r0-root-z100-after": 21.3,
+  "crop-keys-px-r0-root-z100-mid": 17.1,
+  "crop-keys-px-r0-root-z100-on": 20,
+  "crop-keys-px-r0-root-z50-after": 18.8,
+  "crop-keys-px-r0-root-z50-mid": 19,
+  "crop-keys-px-r0-root-z50-on": 16.6,
+  "crop-keys-px-r30-root-z100-after": 20.2,
+  "crop-keys-px-r30-root-z100-mid": 17.6,
+  "crop-keys-px-r30-root-z100-on": 23.4,
+  "crop-keys-px-r30-root-z50-after": 23.6,
+  "crop-keys-px-r30-root-z50-mid": 20.4,
+  "crop-keys-px-r30-root-z50-on": 17.1,
+  "crop-late-px-r0-root-z100-after": 21.6,
+  "crop-late-px-r0-root-z100-before": 22.2,
+  "crop-late-px-r0-root-z100-on": 19.7,
+  "crop-late-px-r0-root-z50-after": 18.6,
+  "crop-late-px-r0-root-z50-before": 24.2,
+  "crop-late-px-r0-root-z50-on": 15.7,
+  "crop-late-px-r30-root-z100-after": 13.1,
+  "crop-late-px-r30-root-z100-before": 16.5,
+  "crop-late-px-r30-root-z100-on": 20,
+  "crop-late-px-r30-root-z50-after": 15.8,
+  "crop-late-px-r30-root-z50-before": 19.2,
+  "crop-late-px-r30-root-z50-on": 24.2,
+  "crop-none-px-r0-nested-z100": 52.6,
+  "crop-none-px-r0-nested-z50": 35.5,
+  "crop-none-px-r0-root-z100": 45.7,
+  "crop-none-px-r0-root-z50": 35.6,
+  "crop-none-px-r30-nested-z100": 50.5,
+  "crop-none-px-r30-nested-z50": 38.1,
+  "crop-none-px-r30-root-z100": 46.9,
+  "crop-none-px-r30-root-z50": 33.6,
+  "crop-scale-px-r0-root-z100-after": 20.5,
+  "crop-scale-px-r0-root-z100-mid": 24.9,
+  "crop-scale-px-r0-root-z100-on": 20.8,
+  "crop-scale-px-r0-root-z50-after": 14.6,
+  "crop-scale-px-r0-root-z50-mid": 25.8,
+  "crop-scale-px-r0-root-z50-on": 25.6,
+  "crop-scale-px-r30-root-z100-after": 22.8,
+  "crop-scale-px-r30-root-z100-mid": 23.7,
+  "crop-scale-px-r30-root-z100-on": 20.8,
+  "crop-scale-px-r30-root-z50-after": 20.1,
+  "crop-scale-px-r30-root-z50-mid": 22.6,
+  "crop-scale-px-r30-root-z50-on": 19,
+  "crop-size-px-r0-root-z100-after": 23.7,
+  "crop-size-px-r0-root-z100-mid": 21.4,
+  "crop-size-px-r0-root-z100-on": 13.2,
+  "crop-size-px-r0-root-z50-after": 30.1,
+  "crop-size-px-r0-root-z50-mid": 30.2,
+  "crop-size-px-r0-root-z50-on": 25.3,
+  "crop-size-px-r30-root-z100-after": 20.7,
+  "crop-size-px-r30-root-z100-mid": 23.6,
+  "crop-size-px-r30-root-z100-on": 22,
+  "crop-size-px-r30-root-z50-after": 12.5,
+  "crop-size-px-r30-root-z50-mid": 19.8,
+  "crop-size-px-r30-root-z50-on": 21.8,
+  "crop-spin-px-r0-root-z100-after": 17.6,
+  "crop-spin-px-r0-root-z100-mid": 18.8,
+  "crop-spin-px-r0-root-z100-on": 23.1,
+  "crop-spin-px-r0-root-z50-after": 24.2,
+  "crop-spin-px-r0-root-z50-mid": 16.9,
+  "crop-spin-px-r0-root-z50-on": 26.5,
+  "crop-spin-px-r30-root-z100-after": 16.9,
+  "crop-spin-px-r30-root-z100-mid": 23.9,
+  "crop-spin-px-r30-root-z100-on": 20.6,
+  "crop-spin-px-r30-root-z50-after": 21.8,
+  "crop-spin-px-r30-root-z50-mid": 18,
+  "crop-spin-px-r30-root-z50-on": 20.6,
+  "crop-tween-px-r0-nested-z100": 20.1,
+  "crop-tween-px-r0-nested-z50": 18,
+  "crop-tween-px-r0-root-z100": 23.6,
+  "crop-tween-px-r0-root-z50": 20.2,
+  "crop-tween-px-r30-nested-z100": 25.2,
+  "crop-tween-px-r30-nested-z50": 19.5,
+  "crop-tween-px-r30-root-z100": 25.6,
+  "crop-tween-px-r30-root-z50": 21.2,
+  "crop-tween-xpercent-r0-nested-z100": 22.2,
+  "crop-tween-xpercent-r0-nested-z50": 17.3,
+  "crop-tween-xpercent-r0-root-z100": 20.4,
+  "crop-tween-xpercent-r0-root-z50": 18.1,
+  "crop-tween-xpercent-r30-nested-z100": 23,
+  "crop-tween-xpercent-r30-nested-z50": 17.8,
+  "crop-tween-xpercent-r30-root-z100": 24.2,
+  "crop-tween-xpercent-r30-root-z50": 20,
+  "move-fromto-px-r0-root-z100-after": 16.3,
+  "move-fromto-px-r0-root-z100-mid": 22.6,
+  "move-fromto-px-r0-root-z100-on": 16.5,
+  "move-fromto-px-r0-root-z50-after": 27.2,
+  "move-fromto-px-r0-root-z50-mid": 25.7,
+  "move-fromto-px-r0-root-z50-on": 20.3,
+  "move-fromto-px-r30-root-z100-after": 15,
+  "move-fromto-px-r30-root-z100-mid": 22.5,
+  "move-fromto-px-r30-root-z100-on": 22.9,
+  "move-fromto-px-r30-root-z50-after": 25.9,
+  "move-fromto-px-r30-root-z50-mid": 19.8,
+  "move-fromto-px-r30-root-z50-on": 25.5,
+  "move-hold-px-r0-nested-z100": 14.9,
+  "move-hold-px-r0-nested-z50": 25.1,
+  "move-hold-px-r0-root-z100": 16.1,
+  "move-hold-px-r0-root-z50": 21.6,
+  "move-hold-px-r30-nested-z100": 17.3,
+  "move-hold-px-r30-nested-z50": 27.2,
+  "move-hold-px-r30-root-z100": 16.4,
+  "move-hold-px-r30-root-z50": 21.9,
+  "move-hold-xpercent-r0-nested-z100": 14.5,
+  "move-hold-xpercent-r0-nested-z50": 26.5,
+  "move-hold-xpercent-r0-root-z100": 15.2,
+  "move-hold-xpercent-r0-root-z50": 22.3,
+  "move-hold-xpercent-r30-nested-z100": 14.1,
+  "move-hold-xpercent-r30-nested-z50": 28.4,
+  "move-hold-xpercent-r30-root-z100": 15.8,
+  "move-hold-xpercent-r30-root-z50": 22.1,
+  "move-idle-px-r0-nested-z100": 20.7,
+  "move-idle-px-r0-nested-z50": 27.2,
+  "move-idle-px-r0-root-z100": 19.4,
+  "move-idle-px-r0-root-z50": 21.4,
+  "move-idle-px-r30-nested-z100": 21.8,
+  "move-idle-px-r30-nested-z50": 28.6,
+  "move-idle-px-r30-root-z100": 22,
+  "move-idle-px-r30-root-z50": 22.9,
+  "move-keys-px-r0-root-z100-after": 21.8,
+  "move-keys-px-r0-root-z100-mid": 16.1,
+  "move-keys-px-r0-root-z100-on": 21,
+  "move-keys-px-r0-root-z50-after": 25.7,
+  "move-keys-px-r0-root-z50-mid": 20.3,
+  "move-keys-px-r0-root-z50-on": 17.1,
+  "move-keys-px-r30-root-z100-after": 23.1,
+  "move-keys-px-r30-root-z100-mid": 22,
+  "move-keys-px-r30-root-z100-on": 22.7,
+  "move-keys-px-r30-root-z50-after": 19.2,
+  "move-keys-px-r30-root-z50-mid": 25,
+  "move-keys-px-r30-root-z50-on": 18.7,
+  "move-late-px-r0-root-z100-after": 14.6,
+  "move-late-px-r0-root-z100-before": 15.5,
+  "move-late-px-r0-root-z100-on": 21.2,
+  "move-late-px-r0-root-z50-after": 26.3,
+  "move-late-px-r0-root-z50-before": 26.5,
+  "move-late-px-r0-root-z50-on": 25.8,
+  "move-late-px-r30-root-z100-after": 15.5,
+  "move-late-px-r30-root-z100-before": 12.7,
+  "move-late-px-r30-root-z100-on": 18.3,
+  "move-late-px-r30-root-z50-after": 27.3,
+  "move-late-px-r30-root-z50-before": 25.6,
+  "move-late-px-r30-root-z50-on": 20,
+  "move-none-px-r0-nested-z100": 27.6,
+  "move-none-px-r0-nested-z50": 60.7,
+  "move-none-px-r0-root-z100": 33.3,
+  "move-none-px-r0-root-z50": 37.4,
+  "move-none-px-r30-nested-z100": 28.5,
+  "move-none-px-r30-nested-z50": 60.5,
+  "move-none-px-r30-root-z100": 34.4,
+  "move-none-px-r30-root-z50": 37.9,
+  "move-scale-px-r0-root-z100-after": 22.2,
+  "move-scale-px-r0-root-z100-mid": 20.6,
+  "move-scale-px-r0-root-z100-on": 22.2,
+  "move-scale-px-r0-root-z50-after": 17.5,
+  "move-scale-px-r0-root-z50-mid": 19.8,
+  "move-scale-px-r0-root-z50-on": 19.3,
+  "move-scale-px-r30-root-z100-after": 20.8,
+  "move-scale-px-r30-root-z100-mid": 15.8,
+  "move-scale-px-r30-root-z100-on": 16.9,
+  "move-scale-px-r30-root-z50-after": 17.9,
+  "move-scale-px-r30-root-z50-mid": 25,
+  "move-scale-px-r30-root-z50-on": 14.4,
+  "move-size-px-r0-root-z100-after": 21.1,
+  "move-size-px-r0-root-z100-mid": 12.5,
+  "move-size-px-r0-root-z100-on": 22.9,
+  "move-size-px-r0-root-z50-after": 24.2,
+  "move-size-px-r0-root-z50-mid": 22.7,
+  "move-size-px-r0-root-z50-on": 28.7,
+  "move-size-px-r30-root-z100-after": 14.4,
+  "move-size-px-r30-root-z100-mid": 18.4,
+  "move-size-px-r30-root-z100-on": 26,
+  "move-size-px-r30-root-z50-after": 24.1,
+  "move-size-px-r30-root-z50-mid": 17.7,
+  "move-size-px-r30-root-z50-on": 24.2,
+  "move-spin-px-r0-root-z100-after": 16.5,
+  "move-spin-px-r0-root-z100-mid": 21.5,
+  "move-spin-px-r0-root-z100-on": 19.7,
+  "move-spin-px-r0-root-z50-after": 21.9,
+  "move-spin-px-r0-root-z50-mid": 20.2,
+  "move-spin-px-r0-root-z50-on": 23.3,
+  "move-spin-px-r30-root-z100-after": 19.9,
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+  "rotate-fromto-px-r30-root-z100-on": 16.2,
+  "rotate-fromto-px-r30-root-z50-after": 16.3,
+  "rotate-fromto-px-r30-root-z50-mid": 20.4,
+  "rotate-fromto-px-r30-root-z50-on": 16,
+  "rotate-hold-px-r0-nested-z100": 14.2,
+  "rotate-hold-px-r0-nested-z50": 26.8,
+  "rotate-hold-px-r0-root-z100": 21.7,
+  "rotate-hold-px-r0-root-z50": 21.7,
+  "rotate-hold-px-r30-nested-z100": 14.7,
+  "rotate-hold-px-r30-nested-z50": 27.8,
+  "rotate-hold-px-r30-root-z100": 25,
+  "rotate-hold-px-r30-root-z50": 22.3,
+  "rotate-hold-xpercent-r0-nested-z100": 13.2,
+  "rotate-hold-xpercent-r0-nested-z50": 26.3,
+  "rotate-hold-xpercent-r0-root-z100": 22.4,
+  "rotate-hold-xpercent-r0-root-z50": 22.1,
+  "rotate-hold-xpercent-r30-nested-z100": 12.6,
+  "rotate-hold-xpercent-r30-nested-z50": 25.7,
+  "rotate-hold-xpercent-r30-root-z100": 19.6,
+  "rotate-hold-xpercent-r30-root-z50": 21.4,
+  "rotate-idle-px-r0-nested-z100": 18.9,
+  "rotate-idle-px-r0-nested-z50": 26.7,
+  "rotate-idle-px-r0-root-z100": 24.9,
+  "rotate-idle-px-r0-root-z50": 22.1,
+  "rotate-idle-px-r30-nested-z100": 21.2,
+  "rotate-idle-px-r30-nested-z50": 27.7,
+  "rotate-idle-px-r30-root-z100": 27.5,
+  "rotate-idle-px-r30-root-z50": 22.6,
+  "rotate-keys-px-r0-root-z100-after": 20.8,
+  "rotate-keys-px-r0-root-z100-mid": 20,
+  "rotate-keys-px-r0-root-z100-on": 16.7,
+  "rotate-keys-px-r0-root-z50-after": 26.6,
+  "rotate-keys-px-r0-root-z50-mid": 26.2,
+  "rotate-keys-px-r0-root-z50-on": 25.6,
+  "rotate-keys-px-r30-root-z100-after": 18.1,
+  "rotate-keys-px-r30-root-z100-mid": 15.2,
+  "rotate-keys-px-r30-root-z100-on": 19.5,
+  "rotate-keys-px-r30-root-z50-after": 18.9,
+  "rotate-keys-px-r30-root-z50-mid": 15.9,
+  "rotate-keys-px-r30-root-z50-on": 28.3,
+  "rotate-late-px-r0-root-z100-after": 15.1,
+  "rotate-late-px-r0-root-z100-before": 18.3,
+  "rotate-late-px-r0-root-z100-on": 18.1,
+  "rotate-late-px-r0-root-z50-after": 27.3,
+  "rotate-late-px-r0-root-z50-before": 15.6,
+  "rotate-late-px-r0-root-z50-on": 25.9,
+  "rotate-late-px-r30-root-z100-after": 13.7,
+  "rotate-late-px-r30-root-z100-before": 18.4,
+  "rotate-late-px-r30-root-z100-on": 17.1,
+  "rotate-late-px-r30-root-z50-after": 18,
+  "rotate-late-px-r30-root-z50-before": 15.6,
+  "rotate-late-px-r30-root-z50-on": 15,
+  "rotate-none-px-r0-nested-z100": 27.4,
+  "rotate-none-px-r0-nested-z50": 56.3,
+  "rotate-none-px-r0-root-z100": 48.9,
+  "rotate-none-px-r0-root-z50": 33.4,
+  "rotate-none-px-r30-nested-z100": 29.6,
+  "rotate-none-px-r30-nested-z50": 56.9,
+  "rotate-none-px-r30-root-z100": 46.9,
+  "rotate-none-px-r30-root-z50": 33.1,
+  "rotate-none-transform-r0-nested-z100": 25.1,
+  "rotate-none-transform-r0-root-z100": 20,
+  "rotate-none-transform-r30-nested-z100": 22.2,
+  "rotate-none-transform-r30-root-z100": 25.8,
+  "rotate-scale-px-r0-root-z100-after": 21.2,
+  "rotate-scale-px-r0-root-z100-mid": 16.9,
+  "rotate-scale-px-r0-root-z100-on": 17.3,
+  "rotate-scale-px-r0-root-z50-after": 24,
+  "rotate-scale-px-r0-root-z50-mid": 17.7,
+  "rotate-scale-px-r0-root-z50-on": 25,
+  "rotate-scale-px-r30-root-z100-after": 19.2,
+  "rotate-scale-px-r30-root-z100-mid": 17.6,
+  "rotate-scale-px-r30-root-z100-on": 18.1,
+  "rotate-scale-px-r30-root-z50-after": 27.2,
+  "rotate-scale-px-r30-root-z50-mid": 19.1,
+  "rotate-scale-px-r30-root-z50-on": 25.4,
+  "rotate-size-px-r0-root-z100-after": 16.7,
+  "rotate-size-px-r0-root-z100-mid": 12.8,
+  "rotate-size-px-r0-root-z100-on": 13.8,
+  "rotate-size-px-r0-root-z50-after": 17.6,
+  "rotate-size-px-r0-root-z50-mid": 24.7,
+  "rotate-size-px-r0-root-z50-on": 29,
+  "rotate-size-px-r30-root-z100-after": 18.3,
+  "rotate-size-px-r30-root-z100-mid": 19.4,
+  "rotate-size-px-r30-root-z100-on": 14.3,
+  "rotate-size-px-r30-root-z50-after": 18.3,
+  "rotate-size-px-r30-root-z50-mid": 16.5,
+  "rotate-size-px-r30-root-z50-on": 27.4,
+  "rotate-spin-px-r0-root-z100-after": 18.8,
+  "rotate-spin-px-r0-root-z100-mid": 18.2,
+  "rotate-spin-px-r0-root-z100-on": 12.9,
+  "rotate-spin-px-r0-root-z50-after": 27.4,
+  "rotate-spin-px-r0-root-z50-mid": 25.6,
+  "rotate-spin-px-r0-root-z50-on": 16.8,
+  "rotate-spin-px-r30-root-z100-after": 15.9,
+  "rotate-spin-px-r30-root-z100-mid": 18,
+  "rotate-spin-px-r30-root-z100-on": 12.5,
+  "rotate-spin-px-r30-root-z50-after": 19.4,
+  "rotate-spin-px-r30-root-z50-mid": 23.4,
+  "rotate-spin-px-r30-root-z50-on": 15.5,
+  "rotate-tween-px-r0-nested-z100": 14.3,
+  "rotate-tween-px-r0-nested-z50": 25.7,
+  "rotate-tween-px-r0-root-z100": 19.9,
+  "rotate-tween-px-r0-root-z50": 20.1,
+  "rotate-tween-px-r30-nested-z100": 16.6,
+  "rotate-tween-px-r30-nested-z50": 26.9,
+  "rotate-tween-px-r30-root-z100": 21.2,
+  "rotate-tween-px-r30-root-z50": 20.7,
+  "rotate-tween-xpercent-r0-nested-z100": 13.2,
+  "rotate-tween-xpercent-r0-nested-z50": 24.9,
+  "rotate-tween-xpercent-r0-root-z100": 19.1,
+  "rotate-tween-xpercent-r0-root-z50": 20.5,
+  "rotate-tween-xpercent-r30-nested-z100": 14.4,
+  "rotate-tween-xpercent-r30-nested-z50": 26.5,
+  "rotate-tween-xpercent-r30-root-z100": 19.2,
+  "rotate-tween-xpercent-r30-root-z50": 20,
+  "seqab-none-center-r0-nested-z100": 36.5,
+  "seqab-none-center-r0-root-z100": 50.7,
+  "seqab-none-pct-r0-nested-z100": 25.7,
+  "seqab-none-pct-r0-root-z100": 42.7,
+  "seqab-none-px-r0-nested-z100": 25.4,
+  "seqab-none-px-r0-root-z100": 45.1,
+  "seqfastkeys-none-px-r0-root-z100": 37.7,
+  "seqheldtwice-tlhold-px-r0-nested-z100": 31.5,
+  "seqheldtwice-tlhold-px-r0-root-z100": 34.6,
+  "seqinflight-none-center-r0-nested-z100": 24.4,
+  "seqinflight-none-center-r0-root-z100": 45.7,
+  "seqinflight-none-pct-r0-nested-z100": 23.3,
+  "seqinflight-none-pct-r0-root-z100": 39.3,
+  "seqinflight-none-px-r0-nested-z100": 48.6,
+  "seqinflight-none-px-r0-root-z100": 37.9,
+  "seqnudge-none-center-r0-nested-z100": 36.6,
+  "seqnudge-none-center-r0-root-z100": 32.8,
+  "seqnudge-none-pct-r0-nested-z100": 22.4,
+  "seqnudge-none-pct-r0-root-z100": 28.2,
+  "seqnudge-none-px-r0-nested-z100": 50.4,
+  "seqnudge-none-px-r0-root-z100": 35.4,
+  "seqnudgeundo-none-center-r0-nested-z100": 25,
+  "seqnudgeundo-none-center-r0-root-z100": 16.1,
+  "seqnudgeundo-none-pct-r0-nested-z100": 10.8,
+  "seqnudgeundo-none-pct-r0-root-z100": 16.4,
+  "seqnudgeundo-none-px-r0-nested-z100": 16.6,
+  "seqnudgeundo-none-px-r0-root-z100": 15.1,
+  "seqplainkeys-none-center-r0-nested-z100": 65.8,
+  "seqplainkeys-none-center-r0-root-z100": 43.9,
+  "seqplainkeys-none-center-r30-nested-z100": 54.3,
+  "seqplainkeys-none-center-r30-root-z100": 33,
+  "seqplainkeys-none-pct-r0-nested-z100": 57.8,
+  "seqplainkeys-none-pct-r0-root-z100": 43,
+  "seqplainkeys-none-pct-r30-nested-z100": 54.5,
+  "seqplainkeys-none-pct-r30-root-z100": 34.2,
+  "seqplainkeys-none-px-r0-nested-z100": 53.1,
+  "seqplainkeys-none-px-r0-root-z100": 47.3,
+  "seqplainkeys-none-px-r30-nested-z100": 65.1,
+  "seqplainkeys-none-px-r30-root-z100": 34.4,
+  "seqrepeat-none-center-r0-nested-z100": 48,
+  "seqrepeat-none-center-r0-root-z100": 47,
+  "seqrepeat-none-pct-r0-nested-z100": 38,
+  "seqrepeat-none-pct-r0-root-z100": 39.1,
+  "seqrepeat-none-px-r0-nested-z100": 25.6,
+  "seqrepeat-none-px-r0-root-z100": 44.9,
+  "seqresize-none-center-r0-nested-z100": 19.8,
+  "seqresize-none-center-r0-root-z100": 19,
+  "seqresize-none-pct-r0-nested-z100": 45.2,
+  "seqresize-none-pct-r0-root-z100": 20.9,
+  "seqresize-none-px-r0-nested-z100": 50.6,
+  "seqresize-none-px-r0-root-z100": 49,
+  "seqresizedrag-tween-px-r0-nested-z100": 28.5,
+  "seqresizedrag-tween-px-r0-root-z100": 26.6,
+  "seqresizeundo-none-center-r0-nested-z100": 40.7,
+  "seqresizeundo-none-center-r0-root-z100": 18.3,
+  "seqresizeundo-none-pct-r0-nested-z100": 34.4,
+  "seqresizeundo-none-pct-r0-root-z100": 34.6,
+  "seqresizeundo-none-px-r0-nested-z100": 24.7,
+  "seqresizeundo-none-px-r0-root-z100": 23.1,
+  "seqresizeundodrag-tween-px-r0-nested-z100": 26.4,
+  "seqresizeundodrag-tween-px-r0-root-z100": 18.9,
+  "seqrotatenudge-none-center-r0-nested-z100": 15.6,
+  "seqrotatenudge-none-center-r0-root-z100": 34.1,
+  "seqrotatenudge-none-pct-r0-nested-z100": 35.2,
+  "seqrotatenudge-none-pct-r0-root-z100": 32.8,
+  "seqrotatenudge-none-px-r0-nested-z100": 15.7,
+  "seqrotatenudge-none-px-r0-root-z100": 22.2,
+  "seqseek-none-center-r0-nested-z100": 19.6,
+  "seqseek-none-center-r0-root-z100": 30.2,
+  "seqseek-none-pct-r0-nested-z100": 44.7,
+  "seqseek-none-pct-r0-root-z100": 36,
+  "seqseek-none-px-r0-nested-z100": 18.6,
+  "seqseek-none-px-r0-root-z100": 16.7,
+  "sequndo-none-center-r0-nested-z100": 19.7,
+  "sequndo-none-center-r0-root-z100": 26.9,
+  "sequndo-none-pct-r0-nested-z100": 20.6,
+  "sequndo-none-pct-r0-root-z100": 22.7,
+  "sequndo-none-px-r0-nested-z100": 39,
+  "sequndo-none-px-r0-root-z100": 29.2,
+  "textedit-none-px-r0-nested-z100": 22.8,
+  "textedit-none-px-r0-root-z100": 11.5,
+  "textselect-none-px-r0-nested-z100": 20.8,
+  "textselect-none-px-r0-root-z100": 16.1
+}
diff --git a/packages/studio/tests/e2e/edit-accuracy/timings.mjs b/packages/studio/tests/e2e/edit-accuracy/timings.mjs
new file mode 100644
index 0000000000..8646314c7e
--- /dev/null
+++ b/packages/studio/tests/e2e/edit-accuracy/timings.mjs
@@ -0,0 +1,19 @@
+#!/usr/bin/env node
+// Rewrites timings.json, the seconds `shardCases` packs shards by, as each case's median over the given first runs
+// of merge-queue shards: bun run --cwd packages/studio test:edit-accuracy:timings -- <run1/results.json...>
+import { readFileSync, writeFileSync } from "node:fs";
+
+const seconds = new Map();
+for (const file of process.argv.slice(2))
+  for (const c of JSON.parse(readFileSync(file, "utf8")).cases)
+    seconds.set(c.id, [...(seconds.get(c.id) ?? []), c.seconds]);
+
+const median = (values) => {
+  const sorted = [...values].sort((a, b) => a - b);
+  const mid = sorted.length >> 1;
+  return sorted.length % 2 ? sorted[mid] : (sorted[mid - 1] + sorted[mid]) / 2;
+};
+const timings = Object.fromEntries(
+  [...seconds].sort(([a], [b]) => a.localeCompare(b)).map(([id, s]) => [id, +median(s).toFixed(1)]),
+);
+writeFileSync(new URL("timings.json", import.meta.url), `${JSON.stringify(timings, null, 2)}\n`);