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I've used TinyIMG to optimize my images, but according to Page Speed Insights by Google, my page speed hasn't increased. Why?

Page Speeds Insights (PSI), though a good tool for finding optimization opportunities, isn't useful as a scoring system for Shopify sites. The reason is that tools like this rely on algorithms and analysis based on a system of rules to calculate a score. Not all the warnings make sense. Your score could go down, even after you've made various optimization improvements that have clearly made your site faster. For greater accuracy, we recommend using this tool to check your page loading times instead: https://gtmetrix.com/