I saw some dramatic speed improvements when loading games on Windows Phone 7 after installing Update 1.

The following table shows the number of seconds various games took to load, both before and after the update was applied.

Game Before Update After Update
Fruit Ninja 22.68 16.00
I Dig It 24.73 11.68
PES 2011 14.22 10.44
Rise of Glory 34.41 16.30
Tiki Towers 21.48 7.64
iBlast Moki 13.49 10.46
Deer Hunter 3D 36.63 18.46

My Phone: HTC Mozart