[Ticklect]

Summary

Optimize complex Inkpad artwork rendering, vector scene MCP editing and local notebook persistence while maintaining scene identity/revisions, Undo/Redo and atomic backup recovery.

• Raster/path/clip/shadow reuse; batched and in-place vector scene editing, gradients and placement.
• Buffered streaming JSON saves, validated image metadata cache and reused RGBA buffer.
• Avoid redundant Slint model updates and whole-notebook persistence clones.
• Add reproducible benchmarking, MCP/geometry regressions and Windows CI.

Validation

• Local Windows: 107 desktop and 104 MCP Rust tests passed.
• Atomic scene, advanced vector, positioning and geometry Python smoke tests passed.
• Both Win64 release binaries compiled; GitHub Windows CI independently rebuilds and tests PR HEAD.

Limitations

• No proven uniform end-to-end GUI speedup: automated pointer focus issues and order-dependent save timings.
• About 22 MiB sustained GUI RSS high-water growth has not been conclusively attributed.
• See docs/INKPAD_PERFORMANCE_2026-10-29.md for methods and measurement scope.

[coderabbitai]

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