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perf: Trim the package manifest parser when no manifest is embedded - #26058
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Package parses an embedded Package.appxmanifest with XmlDocument and XPath, which keeps System.Private.Xml in every trimmed app even where no manifest is embedded (WebAssembly heads), so the parse never runs. Heads without one now turn the parser off through a feature switch: -150 KB brotli on a blank WebAssembly app. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01TXMNu2RupRy4QPFGK2cmij
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GitHub Issue: closes #26052
PR Type:
✨ Feature
What changed? 🚀
Package.ParsePackageManifestusesXmlDocumentand XPath, which keepsSystem.Private.Xmlin every trimmed app, even WebAssembly heads that embed no manifest and therefore never parse one.The parser now sits behind a
[FeatureSwitchDefinition("Uno.ApplicationModel.Package.IsManifestEmbedded")]switch. Heads without an embeddedPackage.appxmanifestturn it off (RuntimeHostConfigurationOption,Trim="true"). Heads that embed one (desktop) are unchanged.Blank WebAssembly app: −150 KB brotli (
System.Private.Xmlremoved, CoreLib −9 KB).Validation:
System.Private.Xml.wasmno longer shipped.Packagebehavior on WASM is unchanged, since no manifest was embedded before either.Measurements
Measured on adjacent builds: the same tree just before and just after this commit.
How this was measured
Blank
dotnet new unoapp(Skia,net10.0-browserwasm, Release publish), built twice from the same tree: with all six startup PRs (#26054–#26059) plusUnoXamlResourcesTrimming, and with this PR's change removed (adjacent builds). Both builds were served by the same static server (brotli q11, immutable caching for fingerprinted files) and loaded cold in headless Chrome, runs interleaved. "Visually ready" is the first CDP screencast frame identical to the settled final frame. 4G = 9 Mbps down, 85 ms RTT (CDP emulation). Values are medians with (min–max). A difference is only claimed where the ranges don't overlap. Rig: Playwright + Node, available on request.PR Checklist ✅
Screenshots Compare Test Runresults.🤖 Generated with Claude Code
https://claude.ai/code/session_01TXMNu2RupRy4QPFGK2cmij