Brief warning on installing 8.1 (not a problem just a niggle)

I just installed Windows 8.1 on my Asus Vivotab Smart, it installed fine and really quickly. The little warning niggle is that to begin with after starting up the OS became quite sluggish and a laggy for a while after install but after about and hour or two of leaving it the lag went away and the OS is about the same speed as before if not a little faster on desktop mode.