Page load, painting, uploading, everything. It's all very very slow. I use Notion very heavily at work, and until March of this year personally. In early 2020 I switched to Roam and I can't go back now. Roam is so amazingly fast it's like they're cheating or something. I wish every app would adopt the way Roam does it. Load everything up front.

But, everything is slow these days. Aside from Roam, HN and maybe a handful of native iOS apps, I can't really name any app/site that I use on daily basis that isn't painfully slow.

Roam takes a while to startup. Once up, it's quite fast to switch between pages. A bit like an IDE. It's still browser based I think, and there are no native apps for Android and iOS. So I feel constrained when I'm not at the desktop.

Notion mobile apps are quite good, so I never have to tell myself I'll do something when I go to my desktop.

Roam as in the one linked below?

Seems like a very different app to Notion.

https://roamresearch.com

It solves the same problems for me. Because Roam is almost like a markup language, you can make it do a lot of what Notion does. Especially if you use Notion purely as a personal wiki + task manager.

Notion is much better for businesses IMO. Like I said above, I use it for my startup. Specifically for task management, and even for our public docs site, ex: https://docs.haekka.com/

This is why I've never left Notational Velocity. Too hard to switch to something slow.

A bit of everything. Nothing is SUPER bad, it's just always, always a little slower than you'd expect/hope. UI lag and page load are the big ones. Not terrible, just...you can tell it's a big pile of JS written by a team that has prioritised features and graphical design over raw performance.

In dark mode, the desktop app can't even resize the window smoothly without white strips appearing on the right and bottom edges.