The worst frame rasterization time is a nice metric from
such integration tests to indicate the severity of shader
compilation jank. For instance,
the steps above reduce Flutter gallery’s shader compilation
jank and speeds up its worst frame rasterization time on a
Moto G4 from ~90 ms to ~40 ms. On iPhone 4s,
it’s reduced from ~300 ms to ~80 ms. That leads to the visual
difference as illustrated in the beginning of this article.