Thanks for the performance tips, but oddly (?) it's quite bearable as-is. While it does take about 20 seconds to get from just-logged-in to clean start Firefox,

Thanks for the performance tips, but oddly (?) it's quite bearable as-is. While it does take about 20 seconds to get from just-logged-in to clean start Firefox, it's completely fine once it's running. I guess 12G is still a reasonable amount of memory and so I'm mainly reading from cache after that. Terminal apps are completely fine. I haven't tried running IntelliJ but the screen size was always going to be a problem for that so I'm more likely to run things in the bare terminal or from vim or something (I just started playing with Helix and like what I see). So at the moment I'm using ext4 on the SD Card and I'll likely stick with that. If it feels too slow my next attack would be to take a needle file to the dodgy m2 card slot and see if I can get it working again. Failing that, though, I'll try your suggestions.