Claude Code TUI Rendering Slows ~2x on Windows 11 Across Recent Versions

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Users of Claude Code on Windows 11 have reported significant frame rate degradation in the tool's terminal UI, with a detailed bug report (#76745) confirming the issue through instrumented testing. Frame cadence slowed from roughly 62 ms (16 fps) in version 2.1.159 to 99–109 ms (9–10 fps) by version 2.1.207, affecting both the idle spinner and token-streaming phases. A user running Windows 11 Pro on high-end hardware used a ConPTY harness to isolate the problem, ruling out third-party software, terminal emulators, and background system load as causes. Changelog entries referencing CPU usage reductions and per-frame rendering changes across versions 2.1.160 through 2.1.207 suggest the regression accumulated over multiple releases. The only confirmed workaround is downgrading to version 2.1.159, though the reporter has requested Anthropic add a configurable render-FPS setting via a future update.

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