You'll notice
Useful3 Signal1
The cloud session detail panel is much faster on long sessions since it reads stored counts.
What's wrong with this entry?
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What
The session view for Claude Code on the web used to walk every assistant message and tool-use block on each render to count agents and tool calls. It now reads those counts and the last tool used from a stored per-session stats record. Same display, far less work on long sessions.
Evidence
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