34ms regression to cold main first frame start up (6/18)

[mcomella]

We saw a 28ms regression in https://github.com/mozilla-mobile/focus-android/issues/7261 and the next day (6/18) we see another 34ms before it stabilizes for a few days:

These could be related regressions or independent. I filed them as independent to make sure we don't forget to look at the second regression but we should consider investigating both regressions together in https://github.com/mozilla-mobile/focus-android/issues/7261.