Info bar on UPC HD very slow

Funny minor issue on UPC HD I've noticed, if you bring up the 'info bar' (not sure what that's called) and go up/down through the channel list, you can preview what's on the other channels without switching.

For the first 72 channels in either direction it's almost instant, then it gets very slow. It takes 5-10 seconds for the programme info to come up, move on to the next channel and it's another 5-10 seconds, etc.

It looks like it prefetches/caches the info for around 144 channels around the one you're watching, but now that the channel list is potentially longer than that, it takes a while to fetch the info for the extra channels.

Not a major problem, but a little annoying when it can take a minute to check what's showing on a handful of channels.