I will review your whole site code and will give you recommendations which would help you to look your site attractive and increase conversion rate. I do work for optimization too. I can help you with speed optimization for shopify stores. I'll check what version of images you have been using and I will use optimized version of images.This will not impact on quality or somewhere.I'll check for js/css code which can be compressed easily. Moreover I will go through the whole site code as well as app code and if I will notice any unused code.