[porjo]

This presentation from 2022 covers the topic: https://m.youtube.com/watch?v=v8sl8gj9UnA

Note: sound drops out for a couple minutes at 1:30 mark but comes back.

[ahl]

I didn't watch it in its entirety, but I'm familiar with Allan's work. There doesn't seem to be anything fundamental to the design of ZFS that his talk highlights as limiting, but there are many areas that have benefitted from optimization and tuning.