It is not possible to limit the EPG right now, but it's a good idea for a new feature.
I will ask the programmers if it's possible.
I moved this topic into the feature request forum.
It's funny, because I have also a Sony Bravia KD-65XD7505 and it has 2GB RAM, just like the Amazon FireTV I have (2nd generation) for the second TV in my bedroom and I have actually no performance issues on both devices. If there is some buffering, then on both TVs at the same time, which lets me conclude that it must be my IPTV provider.
I have 179 channels in my EPG and it doesn't affect the performance of the IPTV in any way.
I will ask the programmers if it's possible.
I moved this topic into the feature request forum.
It's funny, because I have also a Sony Bravia KD-65XD7505 and it has 2GB RAM, just like the Amazon FireTV I have (2nd generation) for the second TV in my bedroom and I have actually no performance issues on both devices. If there is some buffering, then on both TVs at the same time, which lets me conclude that it must be my IPTV provider.
I have 179 channels in my EPG and it doesn't affect the performance of the IPTV in any way.