Infinite loading to access Wp Smush Settings

Hello everyone! I am having a very bad issue with my brand new WP Smush Pro. I just bought it, tried to set it up but the settings page just doesn't load and keeps running forever. The rest of my dashboard runs blazing fast.

I have around 150k uploads on my wp-content folder.

My stack is a nginx 1.7.0 + hhvm 3.7.0.