What browser were you using? It may need upgraded.
@Enevhar Aldarion It may be Windows, but actually "forcing" is a bit of an overstatement. A person can pay 3 x's as much for something other than Windows and have other problems with which to deal, or they can just switch to HTML5 and fix the underlying lagging problem. Lagging is often more a problem with how HTML5 handles graphics versus how FLASH does. Since they are discontinuing Flash development a person will eventually have to switch to HTML5 or to that much more expensive but 10% (perhaps) better OS on a propitiatory platform. You know, the one where the company will not support anything over 5 years old, period. And of course, you will also have to deal, should you wish to repair that 5+ year old system, with finding a repair tech who knows enough about the 12.5% of the market using that software and who has access to the parts the company refuses to sell directly to anyone not authorized (for a very hefty fee) to distribute said parts. All that and (perhaps) 10% better? I think I'd put that 67% more you would pay for that into a better/faster link to the Internet instead. Just my opinion as an IT manager for nearly 30 years.
AJ