never had a problem. laptop i’m using. mid 2010 mbp 13" 2.4Ghz Core Duo w/ 8GB ram. 500GB, 7200rpm Seagate hdd.
sample rate in traktor 48000, latency adjusted to 192 in settings, for a 9.7ms overall.
i have run all 4 decks maxed out on effects with keylock on, while scratching on one of the decks and i have not had any audio dropouts.
the only thing i do before running traktor is turn my wireless off and eject my time machine drive. i do not have the screen saver running and my computer is not set to sleep or dim the display.