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How xterm.js Uses a WebGL Glyph Atlas to Render Multiple Busy Terminal Panes

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A developer's article explains why running several AI coding agents in split terminal panes places a heavy rendering load on the browser. It describes how xterm.js, the terminal component used in VS Code, batches screen redraws to one per animation frame and only draws visible rows. It contrasts the DOM renderer, which creates many spans and triggers costly layout work under heavy colored output, with the WebGL renderer, which draws each glyph once into a texture atlas and reuses it. The piece also includes a small measurement page so readers can test rendering performance on their own machines.

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