iPhone 3G iOS speed test: 4.0 vs 3.1.3

Here is an interesting video, that compares two iPhone 3G firmwares - 4.0 and 3.1.3. The recently announced iOS 4 seems to be much slower.

Left: iPhone 3G running iOS 4.0 (8A293, upgraded as restore, without final restore from backup)

Right: iPhone 3G running iPhone OS 3.1.3 (7E18)

However many users report that they have the speed of 3.1.3 on iOS 4.0.