iOS: RAF fire takes much longer than actual processes / zoom focus issue

[ZYandu]

Has anyone ever seen this where my RAF wants to take up the entire frame (~15ms) but the processes within don't take very long (~3ms)? My app is running iOS on Cordova with wkwebview.

Long RAFs: https://imgur.com/a/2KVeKJZ

Processes within one RAF: https://imgur.com/a/CnUNSfk

BUT

When I zoom into the canvas (by doing the two finger swipe on the iPad) and then zoom out, the RAF fixes to take up only ~5ms total. 

After zoom trick: https://imgur.com/a/RSzmrTI

Is the PIXI canvas loosing focus, like as if I went to another tab on the web? I'm not sure what is happening here, thanks for any help! ? 

[jonforum]

i don't know why you use canvas app for zooming with pixijs but did you have  

--enable-gpu-rasterization

Am really not sure if this can help but you can maybe experiment with result.
From what i know, it should affect DOM painting and scaling elements.
https://www.chromium.org/developers/design-documents/chromium-graphics/how-to-get-gpu-rasterization

[ivan.popelyshev]

> but the processes within don't take very long 

then its on GPU side. You need better profiling tool. I remember that when I last time used chrome profiler, I saw bars of JS rows  and then bar on GPU row, and RAF started immidiately after las GPU bar ended