Using multiple plugins
Before we go any further, it’s important to point out that you should not use more than one Image Optimization plugin at the same time! Doing so can cause quirky behavior, and it often leads to errors in processing: errors that can only be cleared by creating a ticket and having us deal with it on our end.
It’s extra hassle for everyone involved, so please just don’t do it
Generally speaking, it’s never a good idea to have two plugins performing the same optimization functions anyway. To be clear, you can still use multiple optimization plugins, as long as you don’t duplicate any of the individual functions.