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flutter_gallery's frame build time is super slow on iPhone6S (and possibly other newer iPhones too) #30625
Description
Running flutter drive -t test_driver/transitions_perf.dart inside flutter_gallery gets the following build time benchmarks:
"average_frame_build_time_millis": 22.62587272727273,
"90th_percentile_frame_build_time_millis": 31.072,
"99th_percentile_frame_build_time_millis": 226.192,
"worst_frame_build_time_millis": 367.374,
"missed_frame_build_budget_count": 53,
"average_frame_rasterizer_time_millis": 4.706748858447491,
"90th_percentile_frame_rasterizer_time_millis": 12.663,
"99th_percentile_frame_rasterizer_time_millis": 13.571,
"worst_frame_rasterizer_time_millis": 15.494,
"missed_frame_rasterizer_budget_count": 0,
which is much slower than the iPhone4S and iPhone6 in our device lab. For example:
| iPhone4S | iPhone6 | iPhone6S
average frame build time | 5.76ms | 2.6ms | 22.6ms
The slow build time seems to only happen during the first animation (which is what our driver test is measuring).
This issue was found because of a customer complaint in #28113 (comment) . According to that, this seems to also happen on newer iPhones such as iPhone X.
Actions to be taken:
- Test this on other newer iPhones such as iPhoneX to see how wide this issue is.
- Add iPhone6S or newer iPhones to our device lab. (Maybe create a separate issue to track this.)
- Add more tracings to our UI thread frame build process to figure out why it's slow.
Activity
[-]flutter_gallery's frame build time is super slow on iPhone6S (and possibly all newer iPhones than iPhone6)[/-][+]flutter_gallery's frame build time is super slow on iPhone6S (and possibly other newer iPhones than iPhone6)[/+][-]flutter_gallery's frame build time is super slow on iPhone6S (and possibly other newer iPhones than iPhone6)[/-][+]flutter_gallery's frame build time is super slow on iPhone6S (and possibly other newer iPhones too)[/+]liyuqian commentedon Apr 6, 2019
CC @cbracken @dnfield @digiter for adding iPhone6S or newer iPhones.
liyuqian commentedon Apr 6, 2019
Nevermind, I forgot to add
--profiletoflutter driveso it's in debug mode... Close this issue.dnfield commentedon Apr 6, 2019
Well don't leave us hanging - what are the times in profile mode? 😃
liyuqian commentedon Apr 7, 2019
@dnfield : I just found another issue: the driver test isn't showing any image resources (#30641). That's probably why our driver test is so fast while in practice the app is much slower on first animation build. BTW, here's the profile-mode driver test's benchmark (without showing any images).
Print warning if flutter drive is run in debug (#30747)
github-actions commentedon Aug 30, 2021
This thread has been automatically locked since there has not been any recent activity after it was closed. If you are still experiencing a similar issue, please open a new bug, including the output of
flutter doctor -vand a minimal reproduction of the issue.