tangor - 7:28 pm on Jan 20, 2012 (gmt 0)
Not sure if it is slow to roll out
I believe G learned from the backlash on Panda that too much too soon isn't good for their bottom line and good will perception by the webmaster community (not speaking of us at Webmasterworld, just everybody who operates websites). This time the percent is smaller, less obvious, and probably rolled out in different areas at different times so the perception of "harm" to site income is not as obvious. Chipping away a little is usually much better than a sledgehammer and big chunks.