[orblivion]

UI seems smoother than Trello or Wekan (on my rather slow machine). Though maybe it's because the demo board doesn't have very much data compared to what I have on those other two. And maybe it has fewer features thus far to bloat the frontend.

[loganmarchione]

I believe the demo doesn't connect to a database backend. Their GitHub says "without server features".

https://github.com/plankanban/planka

[orblivion]

My sense is that the thing that makes the other sites laggy on my computer is UI stuff. Maybe not though.