Macbook (early 2011) too slow for rekordbox 5?

I just bought a XDJ RX2 and I am now trying to work with rekordbox DJ. I would like to use the RX2 as a controller, so I connected it with USB an choosed "performance mode". It technically works but I can't work with it.

The wave forms are very slow and lag, browsing doesn't make fun an sometimes the output sound is wrong.

My hardware:
Macbook pro early 2011

2,3 GH i5

16GB Ram

Intel HD Graphics 3000


I already seached for the system requirments on the official page. It should work ...