Note 3 fastmem on custom rom

[VuzeDroid]

I know custom ROMs aren't supported.

When I enable fastmem on my note 3 running a lollipop custom rom the screen is black and no fps count shows. I'm wondering if its due to bad ROM optimization and drivers and if there's any fix

Thanks to any messages in advance, and the amazing development of this app. I'll delete this post later. I don't mean to spam