Optimization opportunities (tracking issue)

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help wantedperformance

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There is a lot of room for improvements to the CPU usage of egui. Here are some things worth investigating:

Try different hash algorithms for Id, FontCache and others.
Precompute vertices for circles and rounded corners in epaint::Tessellator constructor (https://github.com/emilk/egui/pull/1547)
Paint small filled circles using textured rects (by adding a few low-radius circles to the font atlas) (https://github.com/emilk/egui/pull/1616)
Run egui with a proper profiler and see what pops up
- Try https://github.com/mstange/perfrecord
https://github.com/emilk/egui/issues/1098
eframe/native: run App::update and the rendering in different threads
Output a single veretex buffer and index buffer instead of Vec<ClippedPrimitive>
emilk/egui#3862
emilk/egui_plot#18,

Any PR should come with a benchmark.

Research direction: Run a profiler on egui applications and identify hotspots in CPU usage. Look into thread parallelism and buffer merging.
Tech stack: rust
Domain: frontend
Issue type: Performance
Difficulty: 4
Estimated time: Over 1 week
Activity status: Active
Clarity: Clear
Prerequisites: Rust
Newbie friendliness: 20