... All the models are the same...
No, from what I understand, the top models in each release year have twice the
FLASH & RAM memory than the other models. Specifically the Roku XR, Roku
XDS, (?), and Roku 2 XS.
It's possible that I have that wrong, and it's double the FLASH memory only.
Anyway, there have been times when I have paused a video I was watching,
then when I resumed a few minutes later, it was to fast forward a minute or 2.
The video resumed far too quickly to have fetched the new section of video. So
my conclusion is that it must have fetched that part while it was paused.