@JSWolf: Calibre happens to be defaulting to a fairly decent (in terms of speed/quality tradeoff) scaling algorithm, so when we do scale (on vanilla Calibre, always, except for sleep covers w/ Keep AR enabled), we're likely doing a better job than the Kobo

.
@GeoffR: That's unfortunately fairly vague without a description. OTOH, that might also refer to some funky eink waveform refresh update modes (granted, that's fairly low-level, so unlikely, but who knows ;p). Good to know nonetheless

.