What optimizer settings do I use for images, if I have both the Jet Theme and the Google Page Speed Optimizer module?

What optimizer settings do I use for images, if I have both the Jet Theme and the Google Page Speed Optimizer module?

The Image Optimizer inside Jet Theme is a Lite version of any optimizer-type modules. So, considering you have the Google Page Speed Optimizer extension, it leads over the optimizer settings inside the Jet Theme.
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If you have already installed, or are just going to install our Magento 2 Google Page Speed Optimizer extension, then the functionality of this extension will prevail over the Image Optimization and Lazy Load functionality pre-integrated into the theme.

Due to that, we highly recommend not to double up on the image optimization settings simultaneously inside the Jet Theme and the Google Page Speed Optimizer module, it is better to use Google Page Speed Optimizer only.