perf(tui): faster insert mode via persistent tmux control connection#2
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Fabio-RibeiroB merged 2 commits intoFabio-RibeiroB:mainfrom Mar 23, 2026
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Replace per-keystroke subprocess spawning with a single long-lived `tmux -C attach` process. Each key in insert mode is now a plain pipe write (~0.1ms) rather than a fork+exec of tmux send-keys (~5-10ms). Also avoids a redundant filteredSessions() call when entering insert mode. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Summary
tmux send-keyssubprocess with a single persistenttmux -C attachcontrol mode processfilteredSessions()call when entering insert mode withiHow it works
internal/tmux/control.gomaintains a package-leveltmux -C attachprocess. On first use it starts the process, drains its stdout (required so the pipe never blocks), and holds the stdin pipe open.SendKeyFastthen just doesfmt.Fprintf(stdin, "send-keys -t %s '%s'\n", ...)— no process spawn per key.Falls back to the existing
SendKeyssubprocess path if the control session fails to start (e.g. no tmux server).Test plan
i, type — characters should feel near-instantEscexits insert mode cleanly🤖 Generated with Claude Code