[namibj]

For sattelite tv you wouls need to handle over a Gigabit mpeg-2. Not easy.

[mickronome]

Caching without decoding would still be a nice boost, wouldn't it ?

Coupled with a decoder that can manage double the actual frame rate, it should cut the switch time with something like on average 1/4, worst case better than 1/2.

[jimktrains2]

You'd still need the additional tuner(s) to provide the data to cache.