From last update I see issues when I work with the skin UI and I am watching channels in HD, it is just new issue because before it was fluently, right now it take some time to switch over in EPG or menu and it is laggy. When I am watching IPTV streams in SD quality it is fluent as it was before.
I have set :
Allow hardware acceleration OMX - on
Allow hardware acceleration MMAL - on
Limit GUI updates during playback - unlimited
Can you check this out?