[speed_spread]

The main "daily driver" constraint is probably the crypto required to access most modern websites. You can make the leanest and meanest system you can to run great on the slowest machine but the internet is nowadays an unforgiving place.

[charcircuit]

Surely video encoding / decoding is more compute intensive than the crypto. Taking video calls is a reasonable part of being daily driver capable.

[jpc0]

Video delivered in real time over an encrypted connection, this is a double whammy.

You need to both decrypt and decode all at above the framerate of the video, doubt that will be doable on any older hardware, unless ssid hardware has dedicated components for those functions.

If I had to implement this on an old CPU I would likely be passing network, video and encryption off to co-processors and the older chip will effectively only be running control information.

But that that point why not just use a modern low power chip.