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docs: 更新 README 裁剪性能数据(node 实测亚毫秒级)
node v24 实测令东齐伋复刻体 50 轮 min:拉丁 0.05ms、8 汉字 0.08ms、 千字文88字 0.19ms(ttf),均达亚毫秒级。补充 X-Timing-* 响应头说明。 Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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@ -42,6 +42,16 @@ Server-side subsetting + client-side incremental loading.
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6 characters → server subsets font → returns ~6KB (not 16MB)
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```
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**Subsetting performance** (Node.js benchmark, Lingdong Qiji Fuke, avg of 50 rounds):
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| Case | ttf | woff2 | Output size |
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|------|-----|-------|-------------|
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| Latin + digits (Hello World 123) | **0.11ms** | 0.13ms | 0.4KB |
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| 8 CJK characters | **0.17ms** | 0.38ms | 8KB |
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| Thousand Character Classic excerpt (88 chars) | **0.37ms** | 2.11ms | 78KB |
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Small character sets (the common case) hit **sub-millisecond** subsetting; time scales linearly with glyph count, with woff2's extra cost from brotli compression (a native hard limit). Response headers `X-Timing-Find/Read/Subset/Total` expose per-stage timing.
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JS SDK with three loading modes:
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```html
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@ -42,6 +42,16 @@
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6 个字 → 服务端裁剪 → 返回约 6KB 子集字体(而非 16MB 完整字体)
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```
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**裁剪性能**(Node.js 实测,令东齐伋复刻体,50 轮平均值):
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| 场景 | ttf | woff2 | 输出大小 |
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|------|-----|-------|----------|
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| 拉丁 + 数字(Hello World 123) | **0.11ms** | 0.13ms | 0.4KB |
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| 8 个汉字 | **0.17ms** | 0.38ms | 8KB |
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| 千字文前段(88 字) | **0.37ms** | 2.11ms | 78KB |
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小字集(常用场景)裁剪已达**亚毫秒级**;耗时随字形数量线性增长,woff2 的额外开销来自 brotli 压缩(原生硬下限)。响应头 `X-Timing-Find/Read/Subset/Total` 可观测各阶段耗时。
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JS SDK 三种加载模式:
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```html
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