CainIV - 3:53 am on Mar 14, 2011 (gmt 0)

I haven't seen traffic lifts, and I would guess that Google likely isn't going after websites that have good site speed. They would likely target websites where a significantly slower site speed is a detriment to user value.

I was merely pointing out that from a marketing expenditure standpoint, it makes full sense to optimize site performance based on both Google and visitors.