You are probably not the only one. Compared to many other eReaders on the market the Kobo Wifi is still a tad slow.
It has been improved over the previous Kobo model though. The entire machine is a bit more peppy.
Subjectively, I really like the page turn speed on the Kobo Wifi. The previous Kobo was a bit slowish, but other readers like the new Sony's and whatnot turn the pages pretty fast. Faster than I do in real life, truth be told. The Kobo Wifi turns pages just about the speed I do so it feels natural.