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Merged
evoactivity merged 1 commit into from
Jul 19, 2026
Merged

perf(parser): specialized fast path for default-option parsing #15

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84 changes: 42 additions & 42 deletions eksml/BENCHMARKS.md
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Expand Up @@ -25,67 +25,67 @@ Parse an XML string into a tree structure.
</tr>
<tr>
<td><strong>Eksml</strong></td>
<td align="right"><strong>1,221,950 op/s</strong></td>
<td align="right"><strong>87,714 op/s</strong></td>
<td align="right"><strong>66,135 op/s</strong></td>
<td align="right"><strong>35,922 op/s</strong></td>
<td align="right"><strong>13,943 op/s</strong></td>
<td align="right"><strong>16,917 op/s</strong></td>
<td align="right"><strong>14,420 op/s</strong></td>
<td align="right"><strong>1,687,050 op/s</strong></td>
<td align="right"><strong>137,518 op/s</strong></td>
<td align="right"><strong>91,376 op/s</strong></td>
<td align="right"><strong>52,689 op/s</strong></td>
<td align="right"><strong>20,580 op/s</strong></td>
<td align="right"><strong>23,075 op/s</strong></td>
<td align="right"><strong>18,117 op/s</strong></td>
</tr>
<tr>
<td>tXml</td>
<td align="right">1,007,229 op/s</td>
<td align="right">880,187 op/s</td>
<td align="right">--</td>
<td align="right">45,389 op/s</td>
<td align="right">27,982 op/s</td>
<td align="right">9,383 op/s</td>
<td align="right">13,520 op/s</td>
<td align="right">11,369 op/s</td>
<td align="right">49,093 op/s</td>
<td align="right">23,746 op/s</td>
<td align="right">11,110 op/s</td>
<td align="right">11,358 op/s</td>
<td align="right">10,858 op/s</td>
</tr>
<tr>
<td>htmlparser2</td>
<td align="right">523,318 op/s</td>
<td align="right">25,204 op/s</td>
<td align="right">17,709 op/s</td>
<td align="right">10,151 op/s</td>
<td align="right">3,590 op/s</td>
<td align="right">4,942 op/s</td>
<td align="right">3,886 op/s</td>
<td align="right">540,625 op/s</td>
<td align="right">24,978 op/s</td>
<td align="right">16,564 op/s</td>
<td align="right">9,935 op/s</td>
<td align="right">3,237 op/s</td>
<td align="right">4,910 op/s</td>
<td align="right">3,935 op/s</td>
</tr>
<tr>
<td>fast-xml-parser</td>
<td align="right">171,272 op/s</td>
<td align="right">9,932 op/s</td>
<td align="right">7,520 op/s</td>
<td align="right">3,745 op/s</td>
<td align="right">1,360 op/s</td>
<td align="right">2,358 op/s</td>
<td align="right">1,282 op/s</td>
<td align="right">174,929 op/s</td>
<td align="right">9,687 op/s</td>
<td align="right">7,397 op/s</td>
<td align="right">3,277 op/s</td>
<td align="right">1,332 op/s</td>
<td align="right">2,193 op/s</td>
<td align="right">1,113 op/s</td>
</tr>
<tr>
<td>xml2js</td>
<td align="right">133,748 op/s</td>
<td align="right">9,809 op/s</td>
<td align="right">6,727 op/s</td>
<td align="right">3,951 op/s</td>
<td align="right">1,563 op/s</td>
<td align="right">2,080 op/s</td>
<td align="right">1,510 op/s</td>
<td align="right">120,589 op/s</td>
<td align="right">8,880 op/s</td>
<td align="right">7,095 op/s</td>
<td align="right">3,905 op/s</td>
<td align="right">1,591 op/s</td>
<td align="right">2,060 op/s</td>
<td align="right">1,275 op/s</td>
</tr>
<tr>
<td>@xmldom/xmldom</td>
<td align="right">89,126 op/s</td>
<td align="right">5,640 op/s</td>
<td align="right">5,112 op/s</td>
<td align="right">2,604 op/s</td>
<td align="right">895 op/s</td>
<td align="right">1,414 op/s</td>
<td align="right">702 op/s</td>
<td align="right">96,819 op/s</td>
<td align="right">6,170 op/s</td>
<td align="right">5,033 op/s</td>
<td align="right">2,563 op/s</td>
<td align="right">881 op/s</td>
<td align="right">1,398 op/s</td>
<td align="right">718 op/s</td>
</tr>
</table>

Eksml is **1.2-1.5x faster than tXml**, **2.3-3.9x faster than htmlparser2**, **7-11x faster than fast-xml-parser**, and **12-21x faster than xmldom**.
Eksml is **1.7-2.2x faster than tXml**, **3-6x faster than htmlparser2**, **10-16x faster than fast-xml-parser**, and **16-25x faster than xmldom**.

> [!note]
> tXml crashed on the RSS fixture
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2 changes: 1 addition & 1 deletion eksml/README.md
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Expand Up @@ -533,7 +533,7 @@ import {

Eksml is consistently the fastest at parsing, streaming, and tokenization, and leads serialization with `validate: false`. Benchmarks run via [Vitest bench](https://vitest.dev/guide/features.html#benchmarking) against real-world XML fixtures from ~100 B to ~30 KB, plus a synthetic attribute-heavy stress document.

- **DOM parsing**: 1.2-1.5x faster than tXml, 2.3-3.9x faster than htmlparser2, 7-21x faster than fast-xml-parser/xml2js/xmldom
- **DOM parsing**: 1.7-2.2x faster than tXml, 3-6x faster than htmlparser2, 10-25x faster than fast-xml-parser/xml2js/xmldom
- **SAX streaming**: 1.2-1.4x faster than easysax, 2-3.6x faster than htmlparser2/saxes, 3.9-6.4x faster than sax
- **Raw tokenization**: 1.3-1.7x faster than easysax, 1.8-3.4x faster than saxes/htmlparser2, 4.3-6.8x faster than sax
- **Serialization**: Fastest on every fixture with `validate: false`; with validation on (the default), wins RSS/SOAP/Atom/POM while tXml edges small/EPG; 2-7x faster than xmldom and 7-19x faster than fast-xml-parser/xml2js
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