Join Date: Dec 2008
Location: Perth, Australia
Device: Sony PRS-650, Sony PRS-T3, Kindle 3, iPad2, Nexus7v2
My Kobo (original, v1.4) has near instantaneous page changes. Certainly not as quick as a K3 or PRS-650 but still fast enough.
Might be an idea to try another ePUB, perhaps a free one from Smashwords or Baen free library and see if it is not an issue caused by the Oreilly ePUB's.