I now have a version of Instiki that doesn't use Madeleine for its storage. It's using Og instead, and it works really well. It's faster than the other version so far, by feel — don't take that as an objective measurement — and won't have the memory issues that a large Instiki does with Madeleine.
If I get a chance, I'll clean up my modifications and make a patch against Instiki-latest.
4279 aredride 16 0 220m 198m 3664 S 0.0 19.7 31:40.65 ruby