liyuqian bea2385879 Lower the threshold to raster cache pictures (flutter/engine#7687) ...

After removing clips by default, the OpCount of a picture drops
significantly. That makes our old threshold suboptimal. The new
threshold reflects the clip change and will improve our scroll
performance by ~10% for complex_layout and flutter_gallery scroll
benchmarks:

(flutter_gallery) home_scroll_perf frame raster time:
average		9.1ms	-> 7.4ms
90th_percentile	11.3ms	-> 9.2ms
99th_percentile	45ms	-> 38ms

complex_layout_scroll_perf frame raster time:
average		4.8	-> 4.4ms
90th_percentile	7.8ms	-> 5.4ms
99th_percentile	19ms	-> 17ms

This should also help mitigate issues like
https://github.com/flutter/flutter/issues/24782

2019-02-04 14:56:13 -08:00

..

src/flutter

Lower the threshold to raster cache pictures (flutter/engine#7687)

2019-02-04 14:56:13 -08:00