I had this exact same problem when I first installed Cross DJ 1.7.1 on my new laptop, which is also running Windows 7 64bit.
What I did to solve it, is to disable everything I didn't need for the session - I turned off wifi, bluetooth, indexing and all power-saving options (there was a high-performance setting for the last one).
Also, if you have the dual-graphics option, set Cross to use the high-performance graphics card.
I also stopped a lot of programs from running at boot - I had a lot of stuff there that I didn't want running in the background, such as iTunes Helper, Google update, Java update etc.
I'd be happy to help you try to sort this problem out if you like, but I'd need the specs of your computer to really help.

Summer is here! Only 4 things we need - cold beer, hot ladies, loud music, and more cold beer!

March 2012 Mixvibes DJ of the month
HP Pavilion dv6
2.5 GHz Intel Core i5-2450M
6 GB DDR3 ram
750Gb sata hd
Dual graphics Intel & Radeon
Beats Audio sound system
Windows 7 Home Premium 64bit
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