The Web is getting rife with adware and badly coded pages. Install Tracking Protection Lists which will cut down on the crap loaded on sites. I use Easy List, Easy Privacy, and Stop Google Tracking.I have a work supplied i5 SP3. It has worked great for the last few months and the last week or so I can not open many web pages. It is very strange since about 50% of the sites work fine and others won't open at all or work VERY slowly. I have all of the latest updates, I've reset Internet Explorer a few times as well. Sometimes I can "Forget This Connection" and reconnect and I'm OK for a bit and then it'll slow to a crawl again.
I'm using Win 8.1 and IE11 desktop version. No addons, default settings for IE. I tried setting the network adaptor to 5Ghz and 2.4 Ghz only as well as suggested by another site, but neither helped.'
Note some embedded Youtube videos will not play with the later but will if you use the link to go to Youtube directly.