I've been experiencing the same lag/delay when trying to play audio files in MV, including during gameplay, (which is very frustrating. I'd rather not have songs take 3-5 seconds to start playing throughout the entire game,) and this hasn't been remedied by removing all the m4a files as other threads have mentioned. The more concerning problem, though, is this error that keeps popping up; When this error pops up all audio in RPG Maker MV stops playing altogether, and the program needs to be restarted for anything to be played again. I converted all the .mp3 files I was using for VXAce to .ogg for MV, and some of them cause this error outright every time I try to play them. I can chalk it up to a bad conversion, but even the built-in RTP tracks will cause this randomly. Sometimes I can listen to a dozen songs before it pops up, sometimes it pops up on the first track I try to play. As frustrating as the auto-tile lag and delayed audio issues are, this is the worst one yet, but I've only seen a couple other people actually mention having this problem, and not a single one of them on these forums. What is QtWebEngine? A google search returned nothing that sounds like it has anything to do with RPG Maker or .ogg files, so I'm really confused here. Regardless of whether it works properly or not, I'd like to know why this process needs to run with MV, and why it's such a memory/cpu hog, to boot.