Some settings for mac and trying out scalability settings

Config/IOS/IOSEngine.ini

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+; =============================================================================
+; ProjectEleri - IOS platform engine config
+; =============================================================================
+; Layered on top of Config/DefaultEngine.ini for the IOS target platform ONLY
+; (config hierarchy pattern <Project>/Config/<PLATFORM>/<PLATFORM>Engine.ini,
+; see UBT ConfigHierarchy.cs and FConfigCacheIni), so nothing in this file
+; changes PC / Mac / Android behaviour.
+;
+; Purpose: benchmarking. Unreal's IOS defaults lock the game to 30 FPS and to
+; the display's vertical sync; this file removes both.
+;
+; NOTE: the editor's Project Settings -> Platforms -> iOS panel is evaluated on
+; the *host* platform (Mac) and therefore does not read this file - it will
+; still display the engine defaults ("30 FPS", "Use VSync"). The values below
+; are what the packaged IOS build actually uses.
+;
+; To revert: delete this file (or comment out the entries below).
+; =============================================================================
+
+[/Script/IOSRuntimeSettings.IOSRuntimeSettings]
+; --- the 30 FPS lock --------------------------------------------------------
+; Engine default is PUFRL_30 (Engine/Config/BaseEngine.ini + IOSRuntimeSettings
+; ctor). That value is consumed twice:
+;   * FIOSPlatformRHIFramePacer::IsEnabled() computes
+;       FrameInterval = GetMaxRefreshRate() / FrameRateLock = 60 / 30 = 2
+;     and runs its CADisplayLink at 60/2 = 30 Hz, which gates every rendered
+;     frame -> a hard 30 FPS ceiling on device.
+;   * FMetalDevice::FMetalDevice() stores it into GMetalPresentFramePacing,
+;     which is used by presentDrawableAfterMinimumDuration().
+; PUFRL_None parses to 0, so the pacer runs at the full refresh rate instead.
+FrameRateLock=PUFRL_None
+
+; FIOSPlatformRHIFramePacer::GetMaxRefreshRate() returns a hard-coded 60 unless
+; this is True; with it enabled it returns [UIScreen mainScreen]
+; .maximumFramesPerSecond, i.e. the real panel rate (120Hz on ProMotion devices).
+; Required to benchmark above 60 FPS.
+bEnableDynamicMaxFPS=True
+
+; Emits <key>CADisableMinimumFrameDurationOnPhone</key><true/> into the Info.plist
+; generated by UEDeployIOS. Without that key iOS clamps the app to 60Hz even when
+; the frame pacer is allowed to go higher. It is a build-time value: rebuild the
+; IOS target with UBT so Build/IOS/UBTGenerated/Info.Template.plist is regenerated
+; (it is consumed by BUILD/BuildIOS.sh when xcodebuild builds the .app).
+bSupportHighRefreshRates=True
+
+[/Script/Engine.Engine]
+; --- no frame rate smoothing ------------------------------------------------
+; Frame rate smoothing is the only thing that applies SmoothedFrameRateRange
+; (Config/DefaultEngine.ini currently has UpperBound=200). Engine/Config/
+; BaseEngine.ini already ships bSmoothFrameRate=false, so this is belt and
+; braces: it keeps the IOS frame rate uncapped even if the "Smooth Frame Rate"
+; project setting is ever switched on in the editor, which would otherwise
+; re-introduce a ceiling behind a setting that does not look IOS specific.
+bSmoothFrameRate=False
+
+[SystemSettings]
+; --- no vsync ---------------------------------------------------------------
+; Unreal derives bLockToVsync from this CVar (Runtime/Engine/Private/
+; UnrealClient.cpp), which on Metal becomes CAMetalLayer.displaySyncEnabled:
+; with the game running fullscreen, 0 => false => presents never wait for the
+; display. It also stops the IOS frame pacer from re-tuning the CADisplayLink
+; interval from rhi.SyncInterval (Engine/Config/Android/AndroidEngine.ini uses
+; the same key, [ConsoleVariables] r.VSync=1, for the opposite reason).
+r.VSync=0
+
+; --- no FPS cap -------------------------------------------------------------
+; t.MaxFPS <= 0 means uncapped (Runtime/Engine/Private/UnrealEngine.cpp, default
+; is already 0 - set explicitly so no stray value can re-introduce a cap).
+t.MaxFPS=0