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HarmonyOS
Foot's Speed and When It's Not: Foot's speed depends. Currently it renders on the CPU and loses to GPU-accelerated terminals in full grid updates. But it can be fast in real time with a render timer.
- VT Parser: Fast and a main reason for Foot's speed in some benchmarks. Compiled with profile guided optimizations and performance analyzed and tweaked.
- Rendering Engine: Not as fast as lightning. Does damage tracking, only rendering updated cells. When only a few cells are updated, it's faster than full grid render.
- Scrolling: Manages to render scrolling without re-rendering entire grid when some original content remains. Implements two scroll damage algorithms.
- Comparison with Alacritty: Alacritty is a modern, GPU-accelerated, Wayland native terminal emulator. It always re-renders the entire grid. It's fast at rendering empty cells but slower at rendering cells with glyphs.
- Final Thoughts: Foot is designed for interactive use and is often fast in benchmarks due to VT parser. The article is not to compare performance but to explain Foot's features and how they affect performance in different situations. Encouraged to try notcurses-demo with on-screen render-timer.
性能
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