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Investigate reducing rrweb2 bundle size #8815

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billyvg opened this issue Aug 14, 2023 · 4 comments
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Investigate reducing rrweb2 bundle size #8815

billyvg opened this issue Aug 14, 2023 · 4 comments
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Package: replay Issues related to the Sentry Replay SDK

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@billyvg
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billyvg commented Aug 14, 2023

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@billyvg billyvg self-assigned this Aug 14, 2023
@billyvg billyvg added the Package: replay Issues related to the Sentry Replay SDK label Aug 14, 2023
@AbhiPrasad
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Copying my comment from the upgrade PR: #8760 (comment)

I skimmed over the rrweb codebase, there's some improvements that can be upstreamed. Looking at https://unpkg.com/[email protected]/dist/rrweb.min.js some easy ones are to use terser and minify private class properties and convert some classes to objects.

So immediate investigation points:

Longer term points:

  • Identify what rrweb API we don't use and see if we can leverage build-time tools to tree-shake them out (like custom rollup plugin that aliases a certain files/functions).

@billyvg billyvg removed their assignment Sep 15, 2023
@billyvg
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billyvg commented Sep 20, 2023

Ran rollup-bundle-analyzer on the replay package, here's what it looks like:

Image

We could make iframe/canvas recording as an explicit opt-in so that its managers are tree-shaken when not used. This shaves off about ~10% from the replay bundle size (minified, 190KB -> 170KB) (Though I haven't tested if rrweb works without these managers).

Image

@billyvg billyvg mentioned this issue Sep 27, 2023
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billyvg added a commit that referenced this issue Sep 27, 2023
@billyvg
feat(replay): Upgrade to rrweb 2.0 (#8760)
398c6ba 
This is fully backwards compatible with prior versions of the Replay
SDK. The only breaking change that we will making is to not be masking
`aria-label` by default. The reason for this change is to align with our
core SDK which also does not mask `aria-label`. This change also enables
better support of searching by clicks.

Another change that needs to be highlighted is the 13% bundle size
increase. This bundle size increase is necessary to bring improved
recording performance and improved replay fidelity, especially in
regards to web components and iframes. We will be investigating the
reduction of the bundle size in [this
PR](#8815).

Here are benchmarks comparing the version 1 of rrweb to version 2

| metric    | v1         | v2         |
| --------- | ---------- | ---------- |
| lcp       | 1486.06 ms | 1529.11 ms |
| cls       | 0.40 ms    | 0.40 ms    |
| fid       | 1.53 ms    | 1.50 ms    |
| tbt       | 3207.22 ms | 3036.80 ms |
| memoryAvg | 131.83 MB  | 124.84 MB  |
| memoryMax | 324.8 MB   | 339.03 MB  |
| netTx     | 282.67 KB  | 272.51 KB  |
| netRx     | 8.02 MB    | 8.07 MB    |
c298lee pushed a commit that referenced this issue Sep 27, 2023
@billyvg @c298lee
feat(replay): Upgrade to rrweb 2.0 (#8760)
bab1849 
This is fully backwards compatible with prior versions of the Replay
SDK. The only breaking change that we will making is to not be masking
`aria-label` by default. The reason for this change is to align with our
core SDK which also does not mask `aria-label`. This change also enables
better support of searching by clicks.

Another change that needs to be highlighted is the 13% bundle size
increase. This bundle size increase is necessary to bring improved
recording performance and improved replay fidelity, especially in
regards to web components and iframes. We will be investigating the
reduction of the bundle size in [this
PR](#8815).

Here are benchmarks comparing the version 1 of rrweb to version 2

| metric    | v1         | v2         |
| --------- | ---------- | ---------- |
| lcp       | 1486.06 ms | 1529.11 ms |
| cls       | 0.40 ms    | 0.40 ms    |
| fid       | 1.53 ms    | 1.50 ms    |
| tbt       | 3207.22 ms | 3036.80 ms |
| memoryAvg | 131.83 MB  | 124.84 MB  |
| memoryMax | 324.8 MB   | 339.03 MB  |
| netTx     | 282.67 KB  | 272.51 KB  |
| netRx     | 8.02 MB    | 8.07 MB    |
@bruno-garcia
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With the work done by @mydea and https://sentry.engineering/blog/session-replay-sdk-bundle-size-optimizations
can we close this or more we can do?

@mydea
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mydea commented Nov 20, 2023

Yes! 🎉

@mydea mydea closed this as completed Nov 20, 2023
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@billyvg @bruno-garcia @mydea @AbhiPrasad