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Seven PreToolUse hooks cost 318 ms per tool call at 10 Claude Code sessions. One process got it to 89 ms.

This story is from 2026-11-11. It is preserved in the archive; the latest stories are on the live feed.

I run many Claude Code sessions on one machine at the same time, often ten or more. Each of them makes a shell call every few seconds, and every shell call goes through the PreToolUse hooks of claude-bulkhead , the plugin I wrote to stop those sessions from killing each other's dev servers, taking…

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  1. 2026-11-11 13:47 · DEV Community — AI
    Seven PreToolUse hooks cost 318 ms per tool call at 10 Claude Code sessions. One process got it to 89 ms.

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