Angels have the Phone Box
What browser(s) have you had this problem with? What plugins/addons are you using in them? Have you tried disabling the extensions? What fixes have you tried so far? Can you provide some example websites so we can try and duplicate the issue?
I've only ever had this problem using Skype for Business, and I've been on W10 since the early days of Tech Previews from October 2014. When I do have a scripting timeout in Skype for Business, I switch to another browser and the problem is solved.