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TextDecoder is slow. #39879

Closed as not planned
Closed as not planned
TextDecoder is slow.#39879
Assignees
anonrig
Labels
encodingIssues and PRs related to the TextEncoder and TextDecoder APIs.performanceIssues and PRs related to the performance of Node.js.staleIssues and PRs marked stale due to inactivity and scheduled for automatic closure.

Description

@jimmywarting
jimmywarting
opened on Aug 25, 2021

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 :)

And the test i run: 
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}
}

Activity

  1. ronag commented on Aug 25, 2021

    @ronag
    ronag
    on Aug 25, 2021
    Member

    @jasnell

  2. Ayase-252
    added
    encodingIssues and PRs related to the TextEncoder and TextDecoder APIs.
    performanceIssues and PRs related to the performance of Node.js.
    on Aug 25, 2021

  3. jasnell commented on Aug 25, 2021

    @jasnell
    jasnell
    on Aug 25, 2021
    Member

    Yeah, it was implemented to be spec compliant and not really to be performant. I'm sure there is lots of room for improvement. I'd love to see someone take on that work.

  4. targos commented on Aug 25, 2021

    @targos
    targos
    on Aug 25, 2021
    Member

    What I found in the mentioned issue is that the time is mostly spent in this function:

    node/src/node_i18n.cc

    Line 432 in e2148d7

    void ConverterObject::Decode(const FunctionCallbackInfo<Value>& args) {

  5. XadillaX commented on Aug 26, 2021

    @XadillaX
    XadillaX
    on Aug 26, 2021
    Contributor

    In my machine, the test code ran in Chrome results in: 49 and 834ms. But Node.js results in 113 and 1730ms.

    When I add two lines in ConverterObject just after `ucnv_toUnicode',

    args.GetReturnValue().Set(Buffer::New(env, 0).ToLocalChecked());
return;

    That means DO NOT do the left logic after decoding via ucnv_toUnicode. It results in 73 and 933ms. I think the left logic is not that fast.

  6. XadillaX commented on Aug 26, 2021

    @XadillaX
    XadillaX
    on Aug 26, 2021
    Contributor

    btw, it seems ret = ToBufferEndian(env, &result); is very slow.

  7. uasan commented on Sep 28, 2021

    @uasan
    uasan
    on Sep 28, 2021

    All I/O optimizations are multiplied by zero, when decoding text, this main cases for clients - Redis, PostgreSQL, etc...

  8. liuxingbaoyu commented on May 7, 2022

    @liuxingbaoyu
    liuxingbaoyu
    on May 7, 2022
    Contributor

    It seems #42695 fixes this issue.

    node

    PS F:\node> F:\node\out\release\node --expose_gc 1\1.js                                                                                                                                      small TextDe decode: 209.075ms
big TextDe decode: 1.765s

PS F:\node> node --expose_gc 1\1.js                    
small TextDe decode: 170.5ms
big TextDe decode: 3.058s

    chrome

    small TextDe decode: 75.279052734375 ms
big TextDe decode: 1370.48095703125 ms

  9. anonrig commented on Nov 8, 2022

    @anonrig
    anonrig
    on Nov 8, 2022
    Member

    Here's the output before after 2 pull requests I opened on TextDecoder:

    Before (v18.11.0):

    small TextDe decode: 51.216ms
big TextDe decode: 924.02ms

    After (Main):

    small TextDe decode: 23.65ms
big TextDe decode: 773.155ms

  10. anonrig commented on Nov 8, 2022

    @anonrig
    anonrig
    on Nov 8, 2022
    Member

    Bun:

    ➜  node-test bun ./text-decoder.js
[23.51ms] small TextDe decode
[129.33ms] big TextDe decode

    Deno:

    ➜  node-test deno run text-decoder.js
small TextDe decode: 50ms
big TextDe decode: 439ms

  11. anonrig commented on Nov 8, 2022

    @anonrig
    anonrig
    on Nov 8, 2022
    Member

    @srl295 do you have any suggestions for optimizations on large values?

  12. jasnell commented on Nov 8, 2022

    @jasnell
    jasnell
    on Nov 8, 2022
    Member

    @srl295 ... as a reminder for context... this is making use of the ucnv_toUnicode API. We don't preflight anything, just allocate a large enough space, call ucnv_toUnicode, and process the result into a v8 string.

  13. anonrig
    self-assigned this
    on Nov 8, 2022
  14. chearon
    added 2 commits that reference this issue on May 19, 2023

    optimize setLanguage, setScript, shapeWithTrace

    2563129

    optimize setLanguage, setScript, shapeWithTrace

    55ffd39

  15. simonbuchan commented on May 26, 2026

    @simonbuchan
    simonbuchan
    on May 26, 2026

    FWIW I quickly checked the OP snippet in a node v24.14.1 script:

    small TextDe decode: 22.908ms
big TextDe decode: 275.741ms

    And pasting in Chrome devtools:

    small TextDe decode: 28.212890625 ms
big TextDe decode: 381.914794921875 ms

    Which is about the extra const I'd expect for the devtools overhead.

    So probably worth re-testing this properly?

  16. github-actions commented on Aug 25, 2026

    @github-actions
    github-actionsbot
    on Aug 25, 2026 – with GitHub Actions
    Contributor

    This issue has been marked as stale due to 90 days of inactivity.
    It will be automatically closed in 30 days if no further activity occurs. If this is still relevant, please leave a comment or update it to keep it open.

  17. github-actions
    added
    staleIssues and PRs marked stale due to inactivity and scheduled for automatic closure.
    on Aug 25, 2026

  18. github-actions commented on Sep 25, 2026

    @github-actions
    github-actionsbot
    on Sep 25, 2026 – with GitHub Actions
    Contributor

    This issue has been automatically closed after 30 days of inactivity following its stale status (no activity for a total of 120 days).
    If this is still relevant, feel free to reopen it or leave a comment with additional details so we can continue the discussion.

  19. github-actions
    closed this as not plannedon Sep 25, 2026
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