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A new step in the Studio timeline viewport job plays a small GSAP film with the Catalog showing. It holds three work counts exactly through perf-ceilings.json (Catalog elements, composited layers, eventful timeline seeks per frame), and times main-thread CPU per frame against the base branch's Studio built on the same runner, in alternating runs, failing above 1.15x. Chrome runs without vsync or a frame cap, so a 60 Hz runner measures what a frame costs, not the display's pace. The catalog, its posters and GSAP are served by the script, so the counts never follow the live registry.