Thank you for super quick reply, I did what you suggested for good measure.
Okay, so temporary fix I found out:
1. Unticking "Disable fullscreen optimizations" for VoiceAttack.exe (for anyone else reading this, this setting should already be unticked by default).
2. launch VoiceAttack like normal.
3. Never run another fullscreen application in addition. For example, I'll watch a YouTube video on my other monitor while I play games, I always make sure it's not in fullscreen (YouTube cinema mode instead).
3.1. Whenever I have to edit commands in VoiceAttack, I always relaunch it after finished editing. If choppy commands still persists, I'll just relaunch it and not touch stuff and it shouldn't be a problem for the rest of my session.
I'll find and update this thread if I ever stumble upon a permanent fix