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https://github.com/Jermolene/TiddlyWiki5
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For my test app with 100K tiddlers and 20K tags, the tag indexer improvement gives a significant improvement:
| Metric | Before | After Tag Indexer | Improvement |
|--------|--------|-------------------|-------------|
| **Initial render** | 261.95ms | 83.51ms | **3.1x faster** |
| **Total refresh** | 2,496.25ms | 1,338.84ms | **1.9x faster (46%)** |
| **Mean refresh** | 416.04ms | 223.14ms | **1.9x faster** |
| **Max refresh** | 480.76ms | 287.26ms | **1.7x faster** |
The specific filter impact: `[subfilter{$:/core/config/GlobalImportFilter}]` went from **1,172ms** (the #1 bottleneck) to effectively **0ms** — it dropped out of the top 20 entirely. That single filter was consuming 47% of total refresh time.
The root cause was that `TagSubIndexer.prototype.update()` was setting `this.index = null` on every tiddler change, forcing a complete rebuild (iterating all 95k tiddlers) on the next tag lookup. The fix makes it incremental — just removing/adding the changed tiddler's tags — which is O(number of tags on the changed tiddler) instead of O(all tiddlers in the wiki).