perf: improve fromBase64 with u16 #5
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ChALkeR
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Dec 1, 2025
fallback/base64.js
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| if (nativeEncoder) { | ||
| if (!helpers.fromMap16) { | ||
| helpers.fromMap16 = new Uint16Array(_zz + 1) // Warning: 64 KiB |
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perhaps a holey array could help here instead
it reduces perf benefit but hermes still wins
need to check mem usage
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Considering this
On the downside, this consumes 64 KiB cache (and +64 KiB for base64url)
On the upside, this improves fallback perf from
5807to9576on Hermes, beatingatob()codepath used now (with7308)Also significantly improves browser fallbacks (but old browsers are not important)
Likely I'll abandon this due to 128 KiB cache being too large