I had this issue before as well. First make sure you have your computer is optimized for performing with dj software. There are lots of videos out there on the internet to help with this. Two, spend a little money on a GOOD (High Data Transfer Rate) USB A to B cable... that alone fixed my static issue. Three, DO NOT LOAD UNECCESSARY SOFTWARE ON THAT COMPUTER. Use another computer for non-DJ related projects. Hope this helps.
I am currently using the RekordBox 6.4.2 and my issues are the following 1. the moment I start the programme (Rekordbox) which takes about 10 minutes to start up because ....(states... reading music files)