If this was the first time your game crashed, you're lucky. If it starts happening a lot you got a problem that you should try to fix. (Mine virtually went away with a memory upgade to my computer and a good dust cleaning probably didn't hurt either )
Check your server realm. I've noticed a lot lately that certain server realms have been "crowded". So look for one that is labeled either "perfect" or "normal". The server realms should be listed in the options (where you would go to exit from the game).