How to Reduce cPanel I/O Usage?

I’m working on a site and the past 2 days it’s been limited by hosting because of input/output usage. There is barely any content on the site. I’m just starting the design. I have plugins installed from WPMU (Hummingbird, Defender, Upfront, Snapshot) and basics (Akismet, Jetpack). I have the site optimized (fully compressed) and am using wp-rocket for caching.

What could be causing the overload to my cPanel? Any advice on how I could reduce the usage? Is there a setting in the cache plugin I should use? A change to the cPanel? Thanks.