Do you mobile optimize your images before you load them onto a website?

Its good practice to do so. Helps them load across a wider range of Internets and browsers etc. If you dont and someone has slower speeds and it takes longer to load then you typically lose a view. I like to get site loading speeds to be close to 1-3 seconds loading time.

If your on a cPanel control panel you can resize right there if not Photoshop/GIMP works well.