Ever since I upgraded to 2.5 and now 2.5.1, I have noticed while I have a deck playing and I am scrolling through my collection on my Mac, it doesn’t scroll smoothly. The collection section and the decks waveforms like stutter/jitter while scrolling.
Audio still plays with no hiccups, but the scrolling is not as smooth as it used to be.
I to doubt it is your hardware if it is able to run seamlessly on my specs (which are in my signature). In the Traktor Settings enable Multi-Core Processor Support. It is worth a try since I figure you are probably running a 1st Generation i5 Processor.