Still fairly new here. Recently set up shopify shop: https://fitness123.co.uk/, but the speed is fairly slow compared to other sites I have used. Can someone please advice what I can do. Im pretty sure this will affect customer interaction with the site.
3) Decrease the size of the oversized images (identified in the results of above). For example, you have images around 1900 pixels loading on mobile devices, where the typical screen width is less than 500px, so you don't need those big images loading on mobile, instead I'd make them around 1200px - 1500px on desktop, and 800px on mobile.
Lazy loading should provide some massive gains, the others will help a little bit.
Creator of Order Automator (auto tag orders / customers + auto fulfillment + more automations). Creator of Shopify Analyzer (1st performance analysis tool for Shopify, free for the community). Founder of Speed Boostr (Shopify optimization experts + app developers). More apps from our team: Tip Jar (add a tip button), File Optimizer (optimize CSS, JS, Liquid).