Defender Issue - Client eCommerce Super Slow

So talked to chat early this morning, we had installed all our plugins from WPMU and went thru steps as it requested, defender keeps emailing me this
https://screenshots.createevs.com/2017-06-12_07-32-36.png
and I mean like 300 so far today via email. It has slowed down the site horrible, and cant figure out how to fix the issue. We tried to regen thumbnails and out of ideas. Appreciate any help