Ok well this may seem simple but.....USE OPERA its a high speed browser thats very good for gaming as its simple and has amazing speed. My entire family uses it for MyVMK. We have tried chrome, firefox, IE (though ie stinks) and a dozen others (yes i have that many browsers) regardless Opera is the best browser i have tried with this game. The 2nd best one i have found for MyVMK is safari though i would say opera is a 9-10 for vmk and safari is a 7-10 there is a big difference but when opera has its issues (since its a smaller browser it takes longer to fix) i can count on safari.
Link:
http://www.opera.com/computer/windows If it ever tells you to download shockwave just click "later" and you'll be good.
Its the most efficient one i have found
Also something you can do to speed your computers capabilities in general is use a "Cleaner" where it cleans bugs, cookies, history etc etc it speeds up the PC's performance and puts less stress on it.
Link to Cleaner i use:
https://www.piriform.com/CCLEANER
I honestly think the problem here is chrome as i tried using chrome with the game and it did stuff like that to my PC so i dug up the old browsers XD
Also be sure your computer isn't to stuffed with stuff (like if you have a 300GB drive don't have 290GB taken) i only have 58 of 690GB used up so i have a very fast PC plus i take care of it and use a cleaner and defrag daily. also if your tech savvy enough you should try searching for corrupt files to make sure thats not hurting your PC (just in general nothing to do with vmk) also check for if you have a firewall in place as not everybody knows if they have it set up or not. also if it works with you being directly connected to the internet via wire then you might just wanna do that.
Hope some of this might help you a tad