Repository: node
Issue: TextDecoder is slow.
Labels: performance,encoding

in #39301 we talked about marking string_decoder as legacy but we also brougth up the perf of String_decoder vs TextDecoder, but we didn't talk much about if there was something wrong with TextDecoder and how it performed agains other environments and why it's slower. or if it can be approved upon.

I conducted a test that runs 10k times in different environment and tested to see how fast it is able to do it's job and nodejs didn't do a good job...

here is the results i got


|         | smallUint8      | bigUint8             |
|---------|-----------------|----------------------|
| chrome  | 78 ms | 1259 ms |
| safari  | 70 ms       | 441 ms           |
| Firefox | 92 ms           | 2889 ms               |
| NodeJS  | **360 ms**       | **4167 ms**               |
| Deno    | 569 ms           | 1386 ms               |

(Lower is better)
`buffer.toString('utf8')` and `string_decoder` is considerable much faster, maybe you can steel something from it and apply it onto the TextDecoder? or do exactly what safari is doing :)

<details>
<summary>And the test i run:</summary>

```js
const {bigUint8, smallUint8} = fixture()
const decoder = new TextDecoder()

console.time('small TextDe decode')
for (let i = 0; i < 100000; i++) decoder.decode(smallUint8)
console.timeEnd('small TextDe decode')

console.time('big TextDe decode')
for (let i = 0; i < 100000; i++) decoder.decode(bigUint8)
console.timeEnd('big TextDe decode')

function fixture () {
const smallUint8 = new Uint8Array([226, 132, 149, 32, 226, 138, 134, 32, 226, 132, 149, 226, 130, 128, 32, 226, 138, 130, 32, 226, 132, 164, 32, 226, 138, 130, 32, 226, 132, 154, 32, 226, 138, 130, 32, 226, 132, 157, 32, 226, 138, 130, 32, 226, 132, 130, 44, 32, 226, 138, 165, 32, 60, 32, 97, 32, 226, 137, 160, 32, 98, 32, 226, 137, 161, 32, 99, 32, 226, 137, 164, 32, 100, 32, 226, 137, 170, 32, 226, 138, 164, 32, 226, 135, 146, 32, 40, 65, 32, 226, 135, 148, 32, 66, 41, 44])
const bigUint8 = new Uint8Array([60,33,68,79,67,84,89,80,69,32,104,116,109,108,62,10,60,104,116,109,108,32,108,97,110,103,61,34,101,110,34,62,10,10,60,104,101,97,100,62,10,32,32,32,32,60,109,101,116,97,32,99,104,97,114,115,101,116,61,34,85,84,70,45,56,34,62,10,32,32,32,32,60,116,105,116,108,101,62,104,116,116,112,98,105,110,46,111,114,103,60,47,116,105,116,108,101,62,10,32,32,32,32,60,108,105,110,107,32,104,114,101,102,61,34,104,116,116,112,115,58,47,47,102,111,110,116,115,46,103,111,111,103,108,101,97,112,105,115,46,99,111,109,47,99,115,115,63,102,97,109,105,108,121,61,79,112,101,110,43,83,97,110,115,58,52,48,48,44,55,48,48,124,83,111,117,114,99,101,43,67,111,100,101,43,80,114,111,58,51,48,48,44,54,48,48,124,84,105,116,105,108,108,105,117,109,43,87,101,98,58,52,48,48,44,54,48,48,44,55,48,48,34,10,32,32,32,32,32,32,32,32,114,101,108,61,34,115,116,121,108,101,115,104,101,101,116,34,62,10,32,32,32,32,60,108,105,110,107,32,114,101,108,61,34,115,116,121,108,101,115,104,101,101,116,34,32,116,121,112,101,61,34,116,101,120,116,47,99,115,115,34,32,104,114,101,102,61,34,47,102,108,97,115,103,103,101,114,95,115,116,97,116,105,99,47,115,119,97,103,103,101,114,45,117,105,46,99,115,115,34,62,10,32,32,32,32,60,108,105,110,107,32,114,101,108,61,34,105,99,111,110,34,32,116,121,112,101,61,34,105,109,97,103,101,47,112,110,103,34,32,104,114,101,102,61,34,47,115,116,97,116,105,99,47,102,97,118,105,99,111,110,46,105,99,111,34,32,115,105,122,101,115,61,34,54,52,120,54,52,32,51,50,120,51,50,32,49,54,120,49,54,34,32,47,62,10,32,32,32,32,60,115,116,121,108,101,62,10,32,32,32,32,32,32,32,32,104,116,109,108,32,123,10,32,32,32,32,32,32,32,32,32,32,32,32,98,111,120,45,115,105,122,105,110,103,58,32,98,111,114,100,101,114,45,98,111,120,59,10,32,32,32,32,32,32,32,32,32,32,32,32,111,118,101,114,102,108,111,119,58,32,45,109,111,122,45,115,99,114,111,108,108,98,97,114,115,45,118,101,114,116,105,99,97,108,59,10,32,32,32,32,32,32,32,32,32,32,32,32,111,118,101,114,102,108,111,119,45,121,58,32,115,99,114,111,108,108,59,10,32,32,32,32,32,32,32,32,125,10,10,32,32,32,32,32,32,32,32,42,44,10,32,32,32,32,32,32,32,32,42,58,98,101,102,111,114,101,44,10,32,32,32,32,32,32,32,32,42,58,97,102,116,101,114,32,123,10,32,32,32,32,32,32,32,32,32,32,32,32,98,111,120,45,115,105,122,105,110,103,58,32,105,110,104,101,114,105,116,59,10,32,32,32,32,32,32,32,32,125,10,10,32,32,32,32,32,32,32,32,98,111,100,121,32,123,10,32,32,32,32,32,32,32,32,32,32,32,32,109,97,114,103,105,110,58,32,48,59,10,32,32,32,32,32,32,32,32,32,32,32,32,98,97,99,107,103,114,111,117,110,100,58,32,35,102,97,102,97,102,97,59,10,32,32,32,32,32,32,32,32,125,10,32,32,32,32,60,47,115,116,121,108,101,62,10,60,47,104,101,97,100,62,10,10,60,98,111,100,121,62,10,32,32,32,32,60,97,32,104,114,101,102,61,34,104,116,116,112,115,58,47,47,103,105,116,104,117,98,46,99,111,109,47,114,101,113,117,101,115,116,115,47,104,116,116,112,98,105,110,34,32,99,108,97,115,115,61,34,103,105,116,104,117,98,45,99,111,114,110,101,114,34,32,97,114,105,97,45,108,97,98,101,108,61,34,86,105,101,119,32,115,111,117,114,99,101,32,111,110,32,71,105,116,104,117,98,34,62,10,32,32,32,32,32,32,32,32,60,115,118,103,32,119,105,100,116,104,61,34,56,48,34,32,104,101,105,103,104,116,61,34,56,48,34,32,118,105,101,119,66,111,120,61,34,48,32,48,32,50,53,48,32,50,53,48,34,32,115,116,121,108,101,61,34,102,105,108,108,58,35,49,53,49,53,49,51,59,32,99,111,108,111,114,58,35,102,102,102,59,32,112,111,115,105,116,105,111,110,58,32,97,98,115,111,108,117,116,101,59,32,116,111,112,58,32,48,59,32,98,111,114,100,101,114,58,32,48,59,32,114,105,103,104,116,58,32,48,59,34,10,32,32,32,32,32,32,32,32,32,32,32,32,97,114,105,97,45,104,105,100,100,101,110,61,34,116,114,117,101,34,62,10,32,32,32,32,32,32,32,32,32,32,32,32,60,112,97,116,104,32,100,61,34,77,48,44,48,32,76,49,49,53,44,49,49,53,32,76,49,51,48,44,49,49,53,32,76,49,52,50,44,49,52,50,32,76,50,53,48,44,50,53,48,32,76,50,53,48,44,48,32,90,34,62,60,47,112,97,116,104,62,10,32,32,32,32,32,32,32,32,32,32,32,32,60,112,97,116,104,32,100,61,34,77,49,50,56,46,51,44,49,48,57,46,48,32,67,49,49,51,46,56,44,57,57,46,55,32,49,49,57,46,48,44,56,57,46,54,32,49,49,57,46,48,44,56,57,46,54,32,67,49,50,50,46,48,44,56,50,46,55,32,49,50,48,46,53,44,55,56,46,54,32,49,50,48,46,53,44,55,56,46,54,32,67,49,49,57,46,50,44,55,50,46,48,32,49,50,51,46,52,44,55,54,46,51,32,49,50,51,46,52,44,55,54,46,51,32,67,49,50,55,46,51,44,56,48,46,57,32,49,50,53,46,53,44,56,55,46,51,32,49,50,53,46,53,44,56,55,46,51,32,67,49,50,50,46,57,44,57,55,46,54,32,49,51,48,46,54,44,49,48,49,46,57,32,49,51,52,46,52,44,49,48,51,46,50,34,10,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,102,105,108,108,61,34,99,117,114,114,101,110,116,67,111,108,111,114,34,32,115,116,121,108,101,61,34,116,114,97,110,115,102,111,114,109,45,111,114,105,103,105,110,58,32,49,51,48,112,120,32,49,48,54,112,120,59,34,32,99,108,97,115,115,61,34,111,99,116,111,45,97,114,109,34,62,60,47,112,97,116,104,62,10,32,32,32,32,32,32,32,32,32,32,32,32,60,112,97,116,104,32,100,61,34,77,49,49,53,46,48,44,49,49,53,46,48,32,67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return {smallUint8, bigUint8}
}
```

</detials>