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perf: reduce hydration target traversal overhead #7685

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f21e9f5
perf: optimize hydration target traversal
janechu Aug 28, 2026
f47ecd6
perf: reduce hydration walker overhead
janechu Aug 28, 2026
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7 changes: 7 additions & 0 deletions change/@microsoft-fast-element-893a7afa-7056-4d39-9257-150cb9bf26f8.json
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Original file line number Diff line number Diff line change
@@ -0,0 +1,7 @@
{
"type": "patch",
"comment": "Preserve hydration target traversal behavior without performing per-node Range membership checks.",
"packageName": "@microsoft/fast-element",
"email": "7559015+janechu@users.noreply.github.com",
"dependentChangeType": "none"
}
10 changes: 5 additions & 5 deletions packages/fast-element/SIZES.md
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Expand Up @@ -4,7 +4,7 @@ Bundle sizes for `@microsoft/fast-element` exports.

| Export | Minified | Gzip | Brotli |
|--------|----------|------|--------|
| CDN Rollup Bundle | 78.79 KB | 23.43 KB | 20.84 KB |
| CDN Rollup Bundle | 78.66 KB | 23.52 KB | 20.88 KB |
| FASTElement (@microsoft/fast-element/fast-element.js) | 23.11 KB | 7.12 KB | 6.41 KB |
| Updates (@microsoft/fast-element/updates.js) | 473 B | 335 B | 290 B |
| Observable (@microsoft/fast-element/observable.js) | 6.75 KB | 2.51 KB | 2.23 KB |
Expand All @@ -15,11 +15,11 @@ Bundle sizes for `@microsoft/fast-element` exports.
| slotted (@microsoft/fast-element/slotted.js) | 4.66 KB | 1.81 KB | 1.59 KB |
| volatile (@microsoft/fast-element/volatile.js) | 6.84 KB | 2.54 KB | 2.26 KB |
| when (@microsoft/fast-element/when.js) | 1.88 KB | 731 B | 589 B |
| html (@microsoft/fast-element/html.js) | 27.91 KB | 8.98 KB | 8.04 KB |
| repeat (@microsoft/fast-element/repeat.js) | 31.80 KB | 10.00 KB | 9.03 KB |
| html (@microsoft/fast-element/html.js) | 27.77 KB | 9.05 KB | 8.12 KB |
| repeat (@microsoft/fast-element/repeat.js) | 31.68 KB | 10.08 KB | 9.09 KB |
| css (@microsoft/fast-element/css.js) | 2.43 KB | 1.00 KB | 911 B |
| enableHydration (@microsoft/fast-element/hydration.js) | 46.71 KB | 13.94 KB | 12.51 KB |
| declarativeTemplate (@microsoft/fast-element/declarative.js) | 62.33 KB | 19.49 KB | 17.46 KB |
| enableHydration (@microsoft/fast-element/hydration.js) | 46.57 KB | 14.01 KB | 12.58 KB |
| declarativeTemplate (@microsoft/fast-element/declarative.js) | 62.20 KB | 19.55 KB | 17.50 KB |
| ArrayObserver (@microsoft/fast-element/arrays.js) | 12.55 KB | 4.46 KB | 4.03 KB |
| observerMap (@microsoft/fast-element/observer-map.js) | 21.96 KB | 7.73 KB | 6.97 KB |
| attributeMap (@microsoft/fast-element/attribute-map.js) | 15.31 KB | 5.41 KB | 4.88 KB |
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