Adding sentry to Remix increases latency by a lot

[aon]

Is there an existing issue for this?

• I have checked for existing issues https://github.com/getsentry/sentry-javascript/issues
• I have reviewed the documentation https://docs.sentry.io/
• I am using the latest SDK release https://github.com/getsentry/sentry-javascript/releases

How do you use Sentry?

Sentry Saas (sentry.io)

Which SDK are you using?

@sentry/remix

SDK Version

8.6.0

Framework Version

2.9.1

Link to Sentry event

No response

SDK Setup

No response

Steps to Reproduce

1. Create a remix project with express as backend
2. Add sentry to your project following instructions in https://docs.sentry.io/platforms/javascript/guides/remix/manual-setup/#installation
3. Add a loader to a page
4. Build and start application
5. See how latency increases

Expected Result

As we're using a localhost environment, latency should be in the order of 1 ms.

Actual Result

Latency is in the order of 200/300ms.

[aon]

See also epicweb-dev/epic-stack#744 and remix-run/remix#9396

[AbhiPrasad]

@aon if you disable performance monitoring by removing tracesSampleRate, does the latency still apply?

[aon]

Removing tracesSampleRate removes the latency as well.

[AbhiPrasad]

So it seems the issue is with performance monitoring. Hopefully this is addressed by #12110 then cc @onurtemizkan