diff --git a/packages/producer/src/services/render/perfSummary.test.ts b/packages/producer/src/services/render/perfSummary.test.ts
index c56e554b9..29aae01d1 100644
--- a/packages/producer/src/services/render/perfSummary.test.ts
+++ b/packages/producer/src/services/render/perfSummary.test.ts
@@ -1,5 +1,6 @@
 import { describe, expect, it } from "vitest";
-import { roundDb } from "./perfSummary.js";
+import { buildRenderPerfSummary, roundDb } from "./perfSummary.js";
+import type { RenderJob } from "../renderOrchestrator.js";
 
 describe("roundDb", () => {
   it("rounds to 1 decimal", () => {
@@ -20,3 +21,46 @@ describe("roundDb", () => {
     expect(roundDb(roundDb(28.4373))).toBe(28.4);
   });
 });
+
+// ponytail: minimal stub — only the fields buildRenderPerfSummary reads are real.
+const baseInput = {
+  job: { id: "r1", config: { fps: { num: 30, den: 1 }, quality: "high" } } as unknown as RenderJob,
+  workerCount: 4,
+  enableChunkedEncode: false,
+  chunkedEncodeSize: 0,
+  compositionDurationSeconds: 5,
+  totalFrames: 150,
+  outputWidth: 1920,
+  outputHeight: 1080,
+  videoCount: 0,
+  audioCount: 0,
+  totalElapsedMs: 1234,
+  perfStages: {},
+  videoExtractBreakdown: undefined,
+  tmpPeakBytes: 0,
+  captureAttempts: [],
+  hdrDiagnostics: { videoExtractionFailures: 0, imageDecodeFailures: 0 },
+  peakRssBytes: 0,
+  peakHeapUsedBytes: 0,
+  dedupPerfs: [],
+};
+
+describe("buildRenderPerfSummary host telemetry", () => {
+  it("captures host facts and threads gpuDisabled through", () => {
+    const summary = buildRenderPerfSummary({ ...baseInput, gpuDisabled: true });
+    expect(summary.host).toBeDefined();
+    expect(summary.host?.gpuDisabled).toBe(true);
+    expect(summary.host?.cpuCount).toBeGreaterThan(0);
+    expect(summary.host?.totalMemMb).toBeGreaterThan(0);
+    expect(summary.host?.platform).toBe(process.platform);
+    expect(summary.host?.arch).toBe(process.arch);
+    expect(summary.host?.nodeVersion).toBe(process.version);
+  });
+
+  it("reflects gpuDisabled=false", () => {
+    const summary = buildRenderPerfSummary({ ...baseInput, gpuDisabled: false });
+    expect(summary.host?.gpuDisabled).toBe(false);
+    // workers vs cores is the headline correlation — both must be present.
+    expect(summary.workers).toBe(4);
+  });
+});
diff --git a/packages/producer/src/services/render/perfSummary.ts b/packages/producer/src/services/render/perfSummary.ts
index e4f4db3fc..50ff45578 100644
--- a/packages/producer/src/services/render/perfSummary.ts
+++ b/packages/producer/src/services/render/perfSummary.ts
@@ -3,6 +3,7 @@
  * the `perf-summary.json` debug artifact.
  */
 
+import { arch, cpus, platform, totalmem } from "node:os";
 import { fpsToNumber } from "@hyperframes/core";
 import type { CapturePerfSummary, SubTimelineWaitOutcome, WorkerSizing } from "@hyperframes/engine";
 import type { CaptureCalibrationSample, CaptureCostEstimate } from "./captureCost.js";
@@ -221,6 +222,8 @@ export function buildRenderPerfSummary(input: {
   /** Per-session/per-worker static-dedup perf; aggregated into `staticDedup`. */
   dedupPerfs: CapturePerfSummary[];
   drawElement?: DrawElementPerfInput;
+  /** `cfg.disableGpu` — the hard `--disable-gpu` flag, for the `host` GPU picture. */
+  gpuDisabled: boolean;
 }): RenderPerfSummary {
   return {
     renderId: input.job.id,
@@ -282,5 +285,13 @@ export function buildRenderPerfSummary(input: {
       input.dedupPerfs,
       input.drawElement ?? { selfVerifyFallback: false },
     ),
+    host: {
+      platform: platform(),
+      arch: arch(),
+      cpuCount: cpus().length,
+      totalMemMb: Math.round(totalmem() / (1024 * 1024)),
+      nodeVersion: process.version,
+      gpuDisabled: input.gpuDisabled,
+    },
   };
 }
diff --git a/packages/producer/src/services/renderOrchestrator.ts b/packages/producer/src/services/renderOrchestrator.ts
index f94affaf6..235c23ee9 100644
--- a/packages/producer/src/services/renderOrchestrator.ts
+++ b/packages/producer/src/services/renderOrchestrator.ts
@@ -546,6 +546,27 @@ export interface RenderPerfSummary {
     /** Per-frame "No cached paint record" screenshot fallbacks. */
     ncprFallbacks: number;
   };
+  /**
+   * Render-host facts, captured from the orchestrator process. Lets fleet-wide
+   * telemetry correlate render performance with the machine it ran on — most
+   * importantly `cpuCount` vs the top-level `workers` (are we under-/over-
+   * subscribing cores?) and `totalMemMb` (does `lowMemoryMode` / single-worker
+   * collapse track real memory pressure?). `gpuDisabled` completes the GPU
+   * picture alongside `observability.browserGpuMode`.
+   *
+   * Reflects the ORCHESTRATOR host. For distributed renders the chunk workers
+   * may run on different machines; this is still the right signal for the
+   * common single-machine render. Optional for back-compat with serialized
+   * older summaries.
+   */
+  host?: {
+    platform: string;
+    arch: string;
+    cpuCount: number;
+    totalMemMb: number;
+    nodeVersion: string;
+    gpuDisabled: boolean;
+  };
 }
 
 export interface HdrDiagnostics {
@@ -3971,6 +3992,7 @@ async function executeRenderPipeline(input: {
       observability: observabilitySummary,
       peakRssBytes: memSampler.peakRssBytes(),
       peakHeapUsedBytes: memSampler.peakHeapUsedBytes(),
+      gpuDisabled: cfg.disableGpu,
     });
     job.perfSummary = perfSummary;
     if (job.config.debug) {