[Epic] Performance improvements

[jeromelaban]

Unsorted

• [ ] #18610

• [ ] StatusBar.PhysicalToLogicalPixels() should cache density or use ViewHelper on Android

• [ ] Remove Json.NET in Lottie addin

• [ ] INITIAL_MEMORY emcc flag guidance

• [ ] Merge embedded resources (localization)

Sorted by order of priority

• [ ] Avoid hashing two times to insert in HashtableEx (See: CollectionsMarshal.GetValueRefOrAddDefault<TKey,TValue>)
• [ ] Fine tune DependencyPropertyDetails arraypool
• [ ] https://github.com/unoplatform/uno/issues/10772
• [x] https://github.com/unoplatform/uno/issues/15804
• [x] https://github.com/unoplatform/uno/issues/15805
• [ ] https://github.com/unoplatform/uno/issues/16814
• [ ] https://github.com/unoplatform/uno/issues/15806
• [ ] https://github.com/unoplatform/uno/issues/15803
• [x] https://github.com/unoplatform/uno/issues/13108
• [ ] https://github.com/unoplatform/uno/issues/13129
• [x] https://github.com/unoplatform/uno/issues/13136
• [x] https://github.com/unoplatform/uno/issues/13110
• [ ] https://github.com/unoplatform/uno/issues/13232
• [ ] https://github.com/unoplatform/uno/issues/13228
• [ ] https://github.com/unoplatform/uno/issues/13281
• [ ] https://github.com/unoplatform/uno/issues/13825
• [ ] https://github.com/unoplatform/uno/issues/13822
• [ ] https://github.com/unoplatform/uno/issues/13947
• [ ] #8925
• [ ] [Wasm] Remove XamlHandle in favor Id in DOM elements
• [ ] [Wasm] Remove XamlType (make it a feature flag)
• [ ] https://github.com/unoplatform/uno/issues/12081
• [ ] TextBlock rich layout uses Obtain and explicit managed builder invocations
• [ ] RemoteControl initialization should be done in the background (devloop improvement)
• [x] https://github.com/unoplatform/uno/issues/9068
• [ ] https://github.com/xamarin/xamarin-android/issues/7479
• [ ] #9010
• [ ] Adjust CoreDispatcher scheduling method (front or back push, VBL batching?)
• [ ] [android] ViewHelper must use DisplayInformation
• [ ] [Android] FrameworkElement.TryCreateKeyRegistration is registering add_KeyPress (causing JNI interop) https://github.com/unoplatform/uno/pull/8882
• [x] #8891
• [ ] https://github.com/unoplatform/uno/issues/13824
• [ ] Migrate string based pieces to Span where appropriate
• [ ] Generate slim android bindings for UI APIs (Related https://github.com/unoplatform/uno/pull/10429)
• [ ] Ensure that Ordinal based comparisons are used most of the time
• [ ] ConerRadiusFilter should not be created eagerly during fluent resources initialization
• [ ] [Android] TextBoxView.SetCursorColor is creating a BlendModeColorFilter (Could it be pooled ?)
• [ ] NativeInstanceHelper should delegate its initialization (particularly the GetFolderPath invocation)
• [ ] FrameworkElement.PerformOnLoaded uses get_Parent and be able to use a cached value?
• [ ] [Android] TextBlock uses View.ImportantForAccessibility and should be using a default value
• [ ] NumberBox should be able to use OnKeyDown override instead of registering to the KeyDown event?
• [ ] #9007
• [ ] [Android] Changing TextBlock.Text is expensive
• [ ] [Android] Changing TextBlock.Foreground is expensive
• [ ] [Android][iOS] GridDeepResizeBenchmark is expensive

Done

• [x] https://github.com/unoplatform/uno/issues/10301
• [x] reduce allocation https://github.com/unoplatform/uno/blob/befbc543aeab66f208040176d1cff87ea94fa8c2/src/Uno.UI/UI/Xaml/DependencyObjectStore.cs#L1561
• [x] Use Array.fill instead of Copy (https://github.com/unoplatform/uno/pull/13132)
• [x] https://github.com/unoplatform/uno/issues/13258
• [x] #10622
• [x] Performance regression with Harfbuzz linux
• [x] Wasm SetProperty should not allocate an array for single property changes
• [x] Adjust converters to avoid using [DefaultConversionExtensions] (https://github.com/unoplatform/uno/blob/96df4c104ac43636f465c0a2d3589b314f43e03e/src/Uno.UI/DataBinding/BindingPropertyHelper.cs#L1094) https://github.com/unoplatform/uno/pull/12700
• [x] GetWinuiThemeResourceUri should not be formatting a string (https://github.com/unoplatform/uno/pull/11991)
• [x] Adjust regex usage in AndroidResourceNameEncoder (Use net7 generated regexes?) (https://github.com/unoplatform/uno/pull/11990)
• [x] [iOS] Border recreate when nothing to draw
• [x] [Android] Resource trimming
• [x] https://github.com/unoplatform/uno/issues/8872
• [x] iOS get_Scale
• [x] #8923
• [x] SelectorItem.UpdateCommonStates uses DateTime.Now causing expensive ICU work #8824
• [x] Remove all RegisterLoadAction uses (Use OnLoaded / OnUnloaded instead) #8734
• [x] [Android] InnerBuildPaint should be moved to java to reduce the interop calls java https://github.com/unoplatform/uno/pull/8882
• [x] GTK dispatcher is very slow (not easilr changeable because of GTK internals)
• [x] https://github.com/unoplatform/uno/issues/10241
• [x] https://github.com/unoplatform/uno/issues/10253

[spouliot]

I can't edit the issue but iOS get_Scale should not be happening anymore since https://github.com/unoplatform/uno/pull/9114 was merged (and calls to UIScreen.MainScreen are cached).