Yes its normal for e ink based e readers, and but by e ink reader standards the k2's page turns is quick and the "flash" minimal . As apposed to the slower older sony 300 , astak eb600, etc... were its pow! flash half second later the page re freshes the K2 very snappy. I still have my libre pro with its lcd screen give almost instantaneous page turns,but it comes at a cost. Much much shorter battery life it quoted 24 hour battery life is pure fiction 12 hours of reading or about every five days I have had to recharge my libre pro. My kindle I bought on 062610 gave it a full charge and didn't re charge to yesterday 071210 !!!!!!
Insane , I read atleast one to two hours every day and also during that time used the 3g to buy a few books and browse the web for about 25mins and I still had at least 30% of my battery left
. Yeah e ink displays are a little slow but the k2 screen quality and superior battery life in my book out weight any speed/flash issues.