Unreal Engine 5 performance

Start with the general loop in game-performance (budget, baseline, one change, measure again). This skill is the Unreal part.

Measure a packaged build

Play In Editor compiles shaders on first use and carries the editor's own cost, so PIE hitches are often not what players see. Confirm everything in a packaged Development build.

• stat unit: Frame, Game (game thread), Draw (render thread), RHIT and GPU times. The largest one is the limit.
• stat game, stat scenerendering, stat rhi (draw calls), stat gpu or ProfileGPU.
• Unreal Insights: launch with -trace=default and open the trace to see which function took a long frame.
• PSO hitches: -LogCmds="LogPSOHitching Verbose" names the material and pass of each pipeline state created at draw time.
• Memory: obj list class=<Class> and memreport -full show which class keeps growing.

Report p50, p95, p99 and the worst frame in ms, from the same route each time.