Happens mostly if I'm in party with anyone, after I've kept the java window open for long times ( I'm talking 10 or more hours without getting disconnected) the GUD start freezing for a couple of seconds every 10-15 seconds or so, reloading the kongregate tab ( thus relaunching the game in a fresh new java window) solves the problem, it's still a problem nonetheless
Evryone experiences issues when logged in long times. Most people close and reconect the client every hour or so, not only in kongregate.