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e0390c0f70
A cold profile switch pays the full pool-backend spawn — Python boot, port announcement, readiness probe, token adoption — before the profile's gateway can even open. Measured with the new CDP harness (scripts/measure-profile-switch.mjs, same family as profile-session-switch.mjs): click → WS open is ~2.5-2.9s on a cold profile, ~3-3.6s to a settled sidebar; a warm profile settles in ~0.5-0.8s. The pointer entering a profile square telegraphs the switch hundreds of ms before the click lands, so start the spawn then. - store/profile: prewarmProfileBackend(name) — fires the existing hermesDesktop.getConnection IPC, which is idempotent (ensureBackend returns the pooled connectionPromise), so the real switch joins the in-flight spawn instead of starting it. Skips the active gateway profile, throttles per profile (60s) so drive-by hovers can't spam spawn attempts, and swallows failures — error UX belongs to the real switch. No new IPC surface; the pool's existing LRU cap + idle reaper still bound resource use, and the LRU guard never evicts a keepalive-fresh backend for a hover spawn. - sidebar/use-profile-prewarm: pointerenter/pointerleave handlers with a 120ms dwell so sweeping the pointer across the rail or a mixed-profile session list doesn't spawn a backend per element crossed. - Wired at the three switch surfaces: rail ProfileSquare, the condensed ProfileDropdown items (extracted ProfileDropdownItem so each row owns its dwell timer), and SidebarSessionRow (covers cross-profile resumes from the all-profiles view; same-profile rows no-op inside the guard). Measured E2E over CDP: synthetic hover on a cold profile square spawns its backend in the background; the subsequent click settles in ~519ms vs ~3.0-3.6s unhovered — and any hover shorter than the spawn still shaves its dwell off the click's wait. Verification: apps/desktop `npx tsc --noEmit` clean; full `npx vitest run` 212 files / 1777 passed (new prewarm guard/throttle tests in store/profile.test.ts); eslint + prettier clean. |
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