[Membership 2 Pro] Document restrictions makes website painfully slow

hi, i have a website where i've tried to enable restrictions on all documents such as PDF's and word documents. The problem is it slows down the website so much that i had to disable it again. I found an old post that it was a problem in an earlier version, but i'm running the latest version, so i'm wondering if there is anything i can setup differently.

Let me know what i need to supply in order for you guys to help me out.

Thanks in advance.