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## Summary Add a `@perf` test measuring the cost of entering a subgraph containing 80 interior nodes. Establishes a CI baseline for the synchronous mount/unmount bottleneck. ## Changes - **What**: Add `subgraph transition (enter and exit)` perf test to `performance.spec.ts` and a test workflow asset (`large-subgraph-80-nodes.json`) with a single subgraph node containing 80 Note nodes. ## Review Focus This is PR 1 of 2. The test establishes a baseline on main so the optimization PR (PR 2) can show a CI-proven delta for `taskDurationMs` and `totalBlockingTimeMs`. The test: 1. Loads the 80-node subgraph workflow 2. Enters and exits once to warm up 3. Measures a fresh enter transition (start → 80 nodes mounted → layout settled) 4. Records `taskDurationMs`, `layouts`, and `TBT` ┆Issue is synchronized with this [Notion page](https://www.notion.so/PR-10480-test-add-perf-test-for-subgraph-transition-bottleneck-32d6d73d3650811b9b6eec03a9591f82) by [Unito](https://www.unito.io) --------- Co-authored-by: GitHub Action <action@github.com> Co-authored-by: Connor Byrne <c.byrne@comfy.org>
