Speed up mount path: cheap arity check, reuse first(), leaner emit - #186
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Adds a bench/ suite (element creation, component mount depth, attribute update at depth, keyed/unkeyed v-for reconciliation, and unkeyed list grow/shrink) using pytest-benchmark with DictRenderer and synchronous event loop, mirroring the setup in the sibling observ repo. The new benchmark workflow runs the suite twice on every PR - once against the master version of collagraph/ and once against the PR version - and fails when mean time regresses more than 5%. The CI test job is scoped to the tests directory so the matrix does not execute benchmarks. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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The allocation burst of list reconciliation triggers collection pauses in some rounds, which inflated stddev on the grow benchmarks to ~40% of the mean - far too noisy for the 5% regression gate in CI. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
- weak(): read __code__.co_argcount instead of building a full inspect.Signature for every wrapped watcher callback; this runs for every dynamic bind during create/mount. - ComponentFragment.mount(): use the existing first() helper to resolve the component root element instead of a hand-rolled BFS with a per-mount deque import. Adds a regression test for a component whose root element sits behind a v-if wrapper. - Component.emit(): avoid creating defaultdict entries for events that have no handlers and skip the set copy when empty. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Resolves conflicts in fragment.py by porting the perf work from master (PRs #186-#188) onto the two-tree fragment model: - Keep both _render_parent (branch) and _component_parent_cache (master) on Fragment. - anchor() keeps the unified render_children() traversal, which subsumes master's separate children/slot_contents lookups. - ListFragment.mount() keeps the lazy loop-invariant anchor from master, applied to _generated_fragments. - ComponentFragment.mount() uses master's simpler `self.component._element = self.first()`. - _invalidate_component_parent_cache() traverses via iter_all_children() instead of the removed children/slot_contents attributes. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Features: - Add pure-Python view API as alternative to cgx templates (#193) - Support text elements for PySide widgets that display text (#191) Fixes & internals: - Fragment parenting overhaul (#162) - Fix PyInstaller hook for CGX files inside packages (#184) - Write compiled AST to temp file when CGX_DEBUG is set (#175) Performance: - Speed up mount path: cheap arity check, reuse first(), leaner emit (#186) - Cache Fragment._component_parent() lookups (#187) - Avoid redundant anchor lookups in Fragment.anchor() and unkeyed v-for (#188) Documentation: - Add MkDocs documentation with GitHub Pages deployment (#176) - Add internals architecture documentation page (#194) - Add docs badge and links to README (#192) Tooling & CI: - Add benchmark suite and per-PR benchmark CI workflow (#185) - Make benchmark CI guard robust against run-to-run noise (#196) - Update GitHub actions from Node 20 to Node 24 (#190) - Migrate from pre-commit to prek (#195) Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
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Summary
Second PR of the performance series (stacked on #185; will retarget to master automatically when that merges).
weak()no longer builds a fullinspect.Signatureper wrapped watcher callback just to count arguments — it reads__code__.co_argcountinstead. This runs for every dynamic bind during create/mount, so it dominates mount cost for elements with bindings.ComponentFragment.mount()resolves the component root element with the existingfirst()helper instead of a hand-rolled BFS (which also importeddequeinside the method on every mount).first()returns the first element in document order, which is also more correct than BFS for uneven subtree depths. Regression test added for a component whose root element sits behind av-ifwrapper.Component.emit()avoids creating a defaultdict entry for events without handlers and skips the set copy when there is nothing to call.Benchmarks (local, macOS, vs base branch)
The benchmark CI workflow will reproduce this comparison automatically once #185 lands.
Test plan
uv run pytest tests -q— 350 passed, 1 skipped (new regression test included)uv run ruff check ./uv run ruff format --check .— cleanuv run pytest bench --benchmark-only --benchmark-compare— no regressions; gains listed above🤖 Generated with Claude Code