There are a lot of URL shortening services out there, but Pingdom has worked out which is the fastest. Reliability and performance is key for URL shortening services and Goo.gl is on top!
As you can see from the above chart Goo.gl has the fastest service in all locations. Additionally, it was reported that they have a 100% uptime. So if you have already checked out the Goo.gl service then make sure you take a look.