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Do you have a lot of bookmarks or browser extensions/add ons? Since you said that you tried all of the browsers, if you imported everything to the browsers then it'll slow down the browsers. Also try clearing the Java cache and internet cache. My computer specs are about the same as yours except my internet connection is worse and the game's been running smoothly for me.
I'll give it ago. Thanks for the advise. When you say it runs well do you have any fps drops or anything though? The game is hardly GFX intensive, it shouldn't really dip at all lol I can run BF4 without any hiccups, surely this should run well 