Its partly the game servers, but It's Mostly Chrome. Chrome is rubbish.

I started getting High Pings in chrome, between 800 and 1300. so I ran Speedtest.net test "in chrome". I got a ping of 508 and a download of 2mbps, which is odd as I have a 40mbps line.
I ran the same speedtest.net test in Internet explorer, and I got a ping of 7 (which is about right) and a download of 38mbps.

So I copied and Pasted the Game URL into IE, and once you get past the usual "Allow site Flash to access your HDD" security (which FTR Chrome didn't ask!!) the game ran at around 200 ping! far better than what I was getting in Chrome browser.

I suggest you try for yourself in a different browser not Chrome.

here are some screen shots I took as proof of test.