Still can't reproduce > 1s lookups on *any* device on my end ^^.
On the devices I have, the bottleneck is clearly I/O, the fastest one (Forma) happens the be the one with the least craptastic I/O performance.
TL;DR: Unless there's a specific quirk going on on newer Kindles that no-one has figured out yet, I'm afraid there's no magic bullet.
(I'd double-check manually with sdcv's CLI, while plugged in, and with the cpu governor pinned to performance, just in case).
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