The recent update (v0.18) performs a lot better than the version running on lemmy.world (v0.17.4), thanks to ripping out the websocket interface and replacing it with HTTP requests. Some instance admins are (understandably) waiting for the CAPTCHA to get refactored before updating though.
The websocket interface provided live-updating feeds and comment sections, along with a lot of bugs. It was pretty cool, but scaled very poorly which made fixing the remaining bugs a futile effort.