It takes at least 5 minutes to fully load so it can be used.
It sounds like it is rebuilding the library every time…
Why is it doing that and what's the fix? It was not doing it with Traktor Scratch 2. Thanks.
Afaik, there is no solution to this yet. I do not have this problem, but there is a similar one with closing Traktor since 3.7:
Why is Traktor Pro 3.7 iso slowly by storing the collection? - Page 2 — Community (native-instruments.com)
Tech Support only assumes that this might have something to do with some files having unusual characteristics. As 3.5.3 does not have that problem, I still stick to this version when playing in public.