Native Terminal Benchmark

Manual Windows benchmark. Run only in an isolated development worktree. It does not connect to an OpenCode service, user profile, or database.

Build from packages/app with bun x vite build --config e2e/performance/terminals/vite.config.ts, then freeze dist outside the repository. Set PLAYWRIGHT_BUILD=1, PLAYWRIGHT_BASE_URL to an unused loopback URL, TERMINAL_BUILD to the frozen build, TERMINAL_ARTIFACTS to an existing external directory, and TERMINAL_RESULTS to an external result directory. Run:

bun x playwright test --config e2e/performance/terminals/playwright.config.ts --repeat-each=20

The runner owns its preview server and each test owns a PowerShell ConPTY process. Session metadata is deterministic. Native output is forwarded through Playwright's WebSocket fixture into the real production Terminal, writer, Ghostty WASM/canvas, and serializer. No output is dropped, paused, or delayed. This is native terminal plus production renderer evidence, not the production PTY backend or Electron IPC.

The workload is 12,000 colored build/test log lines with file paths, durations, and result descriptions. Cases separate visible output, the same output while hidden, and closing the session tab after filling the configured scrollback. Ghostty converts the app's 10,000-line setting to bytes at its initial 80-column width; resizing reduces the effective row capacity. The report records actual retained rows and the first retained fixture record rather than assuming 10,000 rows. Completion requires the final marker in Ghostty and completion of its write callbacks, not just WebSocket delivery. Teardown requires Home readiness and the final serialized snapshot. Input, focus, resizing, and native process survival are checked.

probe.ts is included only by this benchmark build. It observes actual writes, renderer calls, and serialization. Chrome TaskDuration measures renderer task time, not total process CPU or RAM. For attribution, set OPENCODE_PERFORMANCE_TRACE_DIR; keep traced runs separate from clean timing. TERMINAL_DRAW_PROBE=1 separately counts actual canvas draws to verify hidden rendering; do not mix these instrumented samples with clean timing. Use TERMINAL_REVISION and TERMINAL_BUNDLE to identify frozen artifacts. TERMINAL_SCREENSHOTS captures the visible result after timing.

The benchmark has no machine-dependent performance thresholds. Keep raw logs, snapshots, traces, and screenshots outside Git. Run heavy work through the coordinator's exclusive gate when participating in a shared performance wave.