frame-rate

Frame Rate / FPS Caps Skill

A "locked at 60 FPS" editor or game is almost never caused by a single setting — there are five independent caps and any one of them holds the frame rate down. Check and clear them all, in this order, before declaring it fixed.

⚠️ Diagnose first — don't guess

t.MaxFPS = 0 already means uncapped, so if the editor is still stuck at 60 the cap is coming from somewhere else (usually VSync to a 60 Hz monitor, or the smoothed frame-rate range). Read every source below before changing anything.

🩺 "Capped" vs "slow" are different problems. If the frame rate is low rather than pinned at a round number, it's not a cap — it's a workload. Run unreal.PerformanceService.frame_timing() first (NEW service that replaced the removed editor_control tool) for a CPU-vs-GPU-bound verdict before touching any cap below. The caps here only matter when something is artificially holding FPS down. (Cvar/INI reads/writes in this skill stay on EngineSettingsService.)

Note: r.FrameRateLimit is not a console variable in UE 5.7 — set_console_variable will report "Console variable not found". The INI key is FrameRateLimit under [/Script/Engine.Engine], but t.MaxFPS is the reliable runtime cap.

Workflow — read the current state

import unreal
es = unreal.EngineSettingsService

for cvar in ["t.MaxFPS", "r.VSync", "r.VSyncEditor"]:
    print(f"{cvar} = {es.get_console_variable(cvar)}")

eng = "/Script/Engine.Engine"
for key in ["bUseFixedFrameRate", "FixedFrameRate", "bSmoothFrameRate", "SmoothedFrameRateRange"]:
    print(f"{key} = {es.get_engine_ini_value(eng, key, 'DefaultEngine.ini')!r}")

print("bThrottleCPUWhenNotForeground =",
      es.get_engine_ini_value("/Script/UnrealEd.EditorPerformanceSettings",
                              "bThrottleCPUWhenNotForeground", "EditorPerProjectUserSettings.ini"))