Michael Comella

1.3 MB APK size regression in v91.1.2 on 8/16

2

On the Google Play console, we see a regression in the release channel of Focus of 1.3 MB from v91.1.1 to v91.1.2 on August 16th. This is especially surprising because...

~28ms regression to start up around 4/21, all types

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Both COLD VIEW and COLD MAIN show a regression from 4/19 to 4/21. Due to the noise of previous results, it's not clear exactly which date the regression begins: ...

-22ms regression to cold view nav start (7/15)

3

From Nightly 7/14 we see 1.925s to Nightly 7/15 1.947s: 

_see also ~60ms regression to both view and main in fenix https://github.com/mozilla-mobile/fenix/issues/25607_ We see a regression of ~69ms from the 6/9 Nightly (605ms) to the 6/10 Nightly (674ms): 

Consider implementing long press on back button to open back stack

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### Why/User Benefit/User Problem Sometimes a user wants to go back in history by more than one site: this requires them to hit the back button until the page they...

28ms regression to cold main first frame start up (glean metric native library load?)

2

We go from 677ms (6/16 Nightly) to 705ms (6/17 Nightly):  There may be an additional regression into 6/18 or 6/19 (since it's higher than 6/17) but it is hard...

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...

Regression to cold start (main = 50ms, view = 20ms; around 5/10/22)

1

Our nightly results show a regression in cold main start up on 5/10 of about 50ms: And a smaller, gradual increase in cold start view around the same time – ...

~46ms regression to COLD VIEW nav start (Sentry SDK?)

8

On 3/10, we see a regression of about ~46ms from our weekly backfill (that I don't think we see in fenix):  Let's find the cause. You can use [`backfill.py`](https://github.com/mozilla-mobile/perf-tools/blob/main/backfill.py)...

It appears to still be uploading. @rpappalax