The window interface cannot be pulled to the entire screen with the mouse, and the application interface has obvious freezes when the window size is enlarged or reduced
Infuse doesn’t allow the window to be pulled out of proportion during playback - if the video’s aspect ratio is 16:9, the window can’t be pulled either taller or wider. Is that what you’re referring to?
I agree that it’s janky while resizing. Quicktime Player is buttery smooth, and so is the PiP player. (It doesn’t bother me very much.)