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Cairn engine2026.10.1616 Oct 2026

Performance stats

F3 shows where a frame's time goes: CPU time per system, GPU time per render pass, memory and threads, in the editor and over a running game.

What's new

  • F3 opens a Performance window in the editor, and an overlay over a game run from a project.
  • It shows frame times, CPU time for each system (scripts, physics, animation, audio, UI), GPU time for each render pass, and the process's CPU, memory and threads.
  • GPU times come from timer queries that are never waited on, so measuring does not slow the frame down.
  • --stats-log FILE writes every sample to a CSV file, one row per number, so a run before an optimisation can be compared with one after it.
  • For function-by-function timings, a build with profiling on connects to the Tracy profiler.

An exported game has no overlay and no profiler: a finished game carries no debug tools. See Performance.