HD51 4K Slow response

Hi guys picked up the hd51 from Ebay done a fresh install of openatv 6.2 installed my iptv plays fine. 1 problem I come across is when changing channel it takes about 6 secs for channel to show up same when installing plugins it takes ages just to bring up menu any ideas as to what it could be.
 
The HD51 is one of the fastest boxes on the market, I would reflash it with ViX or try a different sub.
 
Unfortunately there are not a lot of OpenPli users on here so help will be a little minimal.
I use openvix with jedimakerxtream and it works great with iptv.
 
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