[Q] How to boost up performance= topic

Hey guys,
do u have some tipps to boost my xoom? After a couple of apps opened (also in background), the xoom reacts very slowly.
Ive got the omnirom 4.4.2, OC to 1.4 GHZ
I also created an SD Swap File of 1 GB
What else could I do? What about ART?
Kind Regards