Website loading extremely slow with Membership plugin

I'm testing with the Membership plugin and noticed today that when enabled, my website was loading extremely slow. I do have WP Super Cache enabled on our testing website.

I kept the Membership plugin enabled for a few hours and testing in different browsers, and on different computers. It continued to load slowly....almost as if WP Super Cache was disabled.

Once I disabled the Membership plugin, my site was back to lightning fast loading speeds.

We are testing this in an Amazon EC2 instance, so we're not testing this on a shared hosting environment. Any help, suggestions, comments on how to get my website running faster with Membership plugin enabled?

Thanks in advance!
Shawn