As Raptr's user base has exploded over the past year, the number one improvement that we wanted to focus on was to ensure that our service remains fast and nimble. "Speed" is one of our company mantras, so we've rewritten both our client and web site which has resulted in significant performance improvements. We are pleased to finally roll out the latest update, version 1.6, which will improve the efficiency of the Raptr client and website by leaps and bounds. We are talking about an average of 66% improvement across the board!

Full post:
http://raptr.com/forums/showthread.php?p=181307#post181307