I'm writing from my brand new installation now. I actually installed
Debian Squeeze, together with a new kernel (2.6.32-5-686).
The problem which was majoritarly present when dealing with e.g. HD
videos was coming from the fact that I was missing the nvidia-libvdpau1
package on the preceding installation (i.e. I did not install it). The
problem was also present here (i.e. brand new install) before installing this package.
After installing it, everything related to HD playing goes quite well. Now, for the
intermittent slowness problems that I had with the previous (old, lenny)
installation, I still can't explain them (anyway, they are only past).
I've however understood why HD videos were read that slowly. Thanks to all!
If all else fails, try the obvious.
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