Finally I think I got to konw what is this BUG exactly. It’s not about those settings, I was confused by this bug to make me believe change any settings cound fix it.
Today I cleared all the changed settings to the default and remote build again, delete old app on device, reinstall it. I am so surprised every thing is as good as before in the 4.22. But after a while when I restart the app, it lags again. And then I killed the app wait a few second (let the memory released) and reopen it every thing works well again.
So it is not just like overloaded, it is overloaded because the problem of the Memory Recycle (memory leak or something like that). After a havey load of sounds the sound lag begins, the game render is not lagging just the sound lags, so the most likely possibility is the Audio Engine’s memory has a recycle issue.
After all, there is only one question: How to fix it? Any way to release audio memory var blueprint? Any ideas?
My project has a big delay since update to 4.25. Really need a quick fix on this. This is my audio and memory info for reference: