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Text rendering performance issues for very long conversations #9799

@peicodes

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@peicodes

Reproduce with conversation from matthew. Process sample shows time spent in text rendering:

https://warpdev.slack.com/archives/C08KTPNQN65/p1772735955220049?thread_ts=1772638143.442889&cid=C08KTPNQN65

Mobileye poc user feedback: "When I'm working on the long chat, the UI is starting to be very sluggish, sometimes freezes again, chat barely responding (need to press ctrl+c to kill the request). Not sure what triggered it. If I switch to another conversation, the UI seems OK, but the AI responds a bit slow."


Linear: APP-3587

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    area:agentAgent workflows, conversations, prompts, cloud mode, and AI-specific UI.area:performanceGeneral application performance, responsiveness, and resource usage.area:performance:cpuCPU utilization, process efficiency, and compute-bound performance.area:ui-frameworkCore Warp UI framework, rendering, layout, and windowing infrastructure.bugSomething isn't working.needs-infoMore issue-specific reporter detail is needed before the problem can be confidently triaged.repro:mediumThe report suggests a plausible repro path, but some uncertainty remains.triagedIssue has received an initial automated triage pass.warp:prioritizedIssues prioritized by the Warp team.

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