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Yoworld is slow on my computer so I use a tablet . it may be that your computer is just slow and maybe not the browser . Actually I don't know anything about lag , so maybe it is the browser ....
I heard if you download facebook gameroom it is faster . I tried to find the link to it in the yoworld update episode 2 thread .But i couldn't find the thread . . You will see the option to download facebook gameroom on the right side of the facebook screen when you are playing a game . I don't have facebok gameroom . but I know that it gets rid of the adds shown on the side . I hope you can find a way to rid the lag . Or even just some of it .
Chrome used to be fastest and most stable, but the latest version is crashing a lot. Firefox is working best, but you have to get the plugin from https://get.adobe.com/flashplayer/. Edge is slower than Chrome, faster than Firefox, but still crashes with a sudden overload of movement. Haven't tried Safari, but you might give that a shot or just wait until the new update to Chrome is out.