Analyze long TBT

[filrak]

If you benchamrk VSF Next most of the metrics is green but one is always red - Total Blocking Time. It's usually between 1.2-1.6 seconds and its our biggest performance bottleneck right now.

This super-long task is a root of all evil

The task here is to

• Analyze what is the cause of such long TBT
• If there are quick wins apply them immediately
• For other potential improvements just list them here so we have a clear view on what is impacting our TBT the most and what we can do about this

References:
https://web.dev/pl/lighthouse-total-blocking-time/
https://web.dev/pl/long-tasks-devtools/

PS:You'll most likely have to add sourcemaps to figure this out ;)