Not sure why this is happening, but whenever I activate the WP Smush Pro plugin my site starts chewing up a ton of resources. I'm seeing apache processes being spawned and never closing out and it just overload the CPU and Memory. The second I deactivate the plugin or remove it, everything recovers. It seems like there may be a conflict somewhere but I can't pinpoint where.
This is on Ubuntu 14 and WP 4.7.2