Great question! That spinning circle is the silent killer of conversions 
In my experience, under 2 seconds is the sweet spot — especially for eCommerce. Beyond that, bounce rates start creeping up fast. But it’s not just about the number; it’s about how usable and interactive the page feels to the user.
And yes — PageSpeed scores are helpful as a baseline, but real-world experience (like Core Web Vitals and actual device testing) matters way more. A 90+ score doesn’t mean much if your site still lags on mobile in real conditions.
Fast is good, but smooth and intuitive? Even better.