User blog comment:Ozuar/Portential Maphite Rework/@comment-5686533-20140320195814/@comment-24420226-20140321210327

It's actually not a whole lot. Most common movement slows are at around 50~60%, with the especially strong ones going well into the 80's (Nasus and Lulu are good examples). For attack speed, that is a little high (but again, there is the Doge).