Slow channel changes

Good morning,

running windows 8 x64 with 8gb ram on an ssd drive, XBMC frodo with nextPVR and the PVR addon (including R2 patches).

it is taking at least 10 seconds to launch a channel for the first time and then 8 or so subsequently.

I am running the AEON NOX skin (if this is a contributing factor).

also, most of the time I can launch live TV, but if i try and change the channel the front end freezes (on the EPG) and then does nothing (still at EPG), if i select the channel again I get live tv.

how do i go about diagnosing what is going wrong!

thanks

Dan