One thing you may want to do to make sure you’re on the up and up with the upcoming Google update, you should check out the must-read primer by Cindy Krum. From this point, hopefully, you’re well on your way to getting prepared for the April 21st start date for being mobile-friendly. If you’re feel you’re doing well, that’s a good sign. The last thing you want to do is to cut corners by cutting performance on your site. This is what you don’t want to do. Google themselves have stated that performance is a factor in search ranking. So the key is don’t lose performance on your site.
Billy Hoffman has a post written on the Moz Blog that deals with how to make sure you keep your site fast for mobile-friendly by covering a few high-level practices to keep in mind during your mobile site design (or redesign) efforts. You can check it out by following the link I’ve posted below.