I am using Windows 10 and have tried Microsoft Edge, Chrome and Firefox (albeit not too recently) and am not seeing any degradation in performance.
In your case, one SWAG is that sorta sounds like some page or script is perhaps trying to access a remote site that is not responding quickly (if ever)? Or maybe the DNS servers are not responding quickly.
I'd suggest trying to change your typical two DNS server entries (Google DNS server entries 8.8.8.8 and/or 8.8.4.4, for example) or even use the OpenDNS servers (see
www.opendns.com for more information) and see if that cures the problem. Remember to clear the caches (not just for the browser but also for the DNS client on your system).
Z