Summary

• Add Control UI timing events for tab visible render, refresh scopes, secondary refresh groups, and attributed gateway RPCs.
• Decouple primary tab feedback from expensive secondary refreshes in Overview, Cron, and Nodes so Sessions/primary panels can render before slower auxiliary calls settle.
• Harden background refresh attribution so cron.runs returns an explicit ok/error/skipped load outcome, stale Cron results are ignored after tab changes, and Overview/Cron secondary groups record duration plus aggregate status.
• Add focused UI controller/gateway coverage for RPC attribution, non-blocking refresh behavior, stale guards, controller-derived Cron failure status, and secret-safe failed-RPC timing payloads.
• Include a one-line Discord test fixture correction from latest main so exact-head check:test-types remains green after rebase.

Fixes #64004.

Security / Performance Audit

• Security-sensitive surface: Control UI TypeScript, tests, and changelog only. No dependency, workflow, package metadata, secret handling, auth policy, or code-execution changes.
• RPC timing payloads intentionally record only id, method, ok, durationMs, slow, and errorCode; request params and response payloads are not stored in the event log. Regression coverage uses a config.get request containing a fake token and asserts timing excludes params.
• Event log storage remains bounded to 250 entries and Overview renders only the top visible subset, preventing unbounded client memory growth from the new telemetry.
• Primary render path now stays independent from slower secondary panels: Overview secondary work and Cron runs no longer block the primary tab refresh, and Nodes loads primary node data before secondary device/config/approval panels settle.
• Background work is stale-guarded by per-refresh sequence plus active-tab checks, so late Overview/Cron completions cannot update the wrong tab.
• cron.runs failures are attributed from the controller's real load outcome instead of promise rejection state, so caught RPC failures record status: "error" while preserving primary Cron tab feedback.

Validation

Rebased head: 84c472c5abd58b66ac6ee5e27f9405a4b08b9b9d.

• pnpm test ui/src/ui/gateway.node.test.ts ui/src/ui/app-gateway.node.test.ts ui/src/ui/app-settings.refresh-active-tab.node.test.ts ui/src/ui/controllers/sessions.test.ts ui/src/ui/controllers/usage.node.test.ts ui/src/ui/controllers/cron.test.ts src/config/zod-schema.providers.lazy-runtime.test.ts src/cli/plugins-install-persist.test.ts src/cli/plugins-cli.install.test.ts extensions/discord/src/monitor/message-handler.preflight-channel-context.test.ts -- --reporter=dot (189 tests across 4 Vitest shards)
• pnpm tsgo:test:ui
• pnpm tsgo:test:src
• pnpm check:test-types
• pnpm exec oxfmt --check --threads=1 extensions/discord/src/monitor/message-handler.preflight-channel-context.test.ts CHANGELOG.md src/cli/plugins-install-persist.test.ts src/config/zod-schema.providers.lazy-runtime.test.ts ui/src/ui/app-gateway.ts ui/src/ui/app-settings.refresh-active-tab.node.test.ts ui/src/ui/app-settings.ts ui/src/ui/control-ui-performance.ts ui/src/ui/controllers/cron.test.ts ui/src/ui/controllers/cron.ts ui/src/ui/gateway.node.test.ts ui/src/ui/gateway.ts
• git diff --check origin/main...HEAD
• pnpm check:changelog-attributions
• Testbox OPENCLAW_TESTBOX=1 pnpm check:changed on tbx_01kqm03gynfzpn8248rb32nrb7

Duplicate / Related Triage

• Canonical fixed issue: [Bug]: Control UI remains slow although sessions.list returns quickly #64004.
• Related umbrella, not closed by this PR: [Feature]: Improve gateway configuration and Web UI chat responsiveness #71631. This PR covers the [Bug]: Control UI remains slow although sessions.list returns quickly #64004 slice: timing attribution plus slow secondary-panel isolation.
• Related open issue, not duplicate-closed by this PR: Bug: Control UI becomes progressively stuck after being open for a while (2026.3.12) #45698. It overlaps the same Control UI responsiveness family, but still includes channels.status, provider/reconnect churn, session-event reloads, and polling behavior outside this patch.
• Related open PRs, not superseded by this PR:
  • fix(ui): reduce polling intervals to prevent progressive UI sluggishness #45930 reduces polling intervals for Bug: Control UI becomes progressively stuck after being open for a while (2026.3.12) #45698 but is currently blocked by log-tail cadence/changelog review findings.
  • Control UI: reduce unnecessary gateway churn and prevent stale index caching #69454 scopes node/session churn and cache behavior; it is complementary and still needs its deferred-reload tab guard, changelog, and rebase cleanup.
• Related but not covered by this PR: control-ui sessions.list polling saturates gateway with many conversations #57974 and Control UI: sessions.list polling too aggressive (8s) #59317 (sessions.list polling/full-scan pressure), [Bug]: Control UI Crashes When Session Conversation History Is Too Large #45687 and [Bug]: Control UI freezes with high CPU when switching sessions via dropdown menu #51685 (large-history/session-switch frontend freezes), [Bug]: Windows local gateway has partial RPC failures/timeouts on v2026.4.9 even when gateway process is running #64476 (partial Windows local RPC timeouts), and Webhook plugin re-registers repeatedly whenever event loop saturates (dreaming, cron catchup, Control UI polling) #75298 (event-loop saturation/webhook re-registration cascade).