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weishu
da5dffd8ec
Profiling a 2,745-session hub while scrolling a chat showed the two longest main-thread stalls (~80 ms) came from the session list, not the transcript: - The home list, covered by the pushed chat, still rebuilt and diffed every row on each session change. A covered list now keeps its last rows and refreshes once on return; a side-by-side split stays live. - DiskCache encoded the 2 MB session snapshot on the main actor after every burst of changes. Encoding now runs with the file write, off it. After the change the trace has no session-list or snapshot work on the main thread and no stall over 50 ms (max 38 ms, from Markdown cells entering the screen).