Google has indicated that site speed is one of the signals used by its algorithm to rank pages.
Even if you don’t notice a speed perceived speed change, a technically faster site can be measured by search crawlers.
All other things being equal, a faster website will rank better than a slower website.
Better User Experience
Faster sites are more fun to interact with.
Most Shopify sites are pretty good with speed on fast internet connections.
The x-factor is on slower mobile connections. This is demographic that you’ll get the most significant gains from optimization.
Increased Conversion Rate
Making a site faster lowers bounce rates, gets customers to checkout faster, and provides an overall more enjoyable experience. These metrics translate into more conversions.
Increased Customers and Revenue
Those first 3 points lead to more traffic and more orders, which leads to your key bottom-line metrics: more customers and more revenue.