I've run into that before too, but I'm talking about the latency when an audio session is already running. There's a latency test in this review of the headphones I have: https://www.rtings.com/headphones/reviews/sony/wh-1000xm4-wi... It's actually worse than I remembered. The iOS latency is 38ms and the Windows latency is 5.5x longer at 212ms. It's bad enough that watching videos is very annoying because the sound is visibly out of sync, and if you look through the other rtings reviews, this is about average for Windows Bluetooth.