Claude diagnoses PC lag caused by Codex leaking ~210 idle MCP helper processes
soumitrashukla9 · x · 2026-10-15
After Codex failed to fix the user's lagging PC, Claude took a look and concluded: 'The problem is Codex.'
Claude's diagnosis: memory, paging, and CPU (40%) looked fine, but the main anomaly was Codex leaking 210 idle MCP helper processes, with a plan to next check GPU, DPC/interrupt latency, and disk queue to pinpoint the lag. The fix worked — and exposed a hidden performance pitfall: AI coding tools leaving idle MCP helper processes behind.
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