I once used Notion at work and for personal note taking. I'd never felt it was "slow." Until later I moved my notes to Obsidian. Now when I have to use Notion at my job it feels sluggish.
Obsidian's local first editing experience makes a huge difference to creativity and flow.
I've been working on making Obsidian real-time collaborative with the Relay [0] plugin. In combination with a few other plugins (and the core Bases plugin) you can build a pretty great Notion alternative.
I'm bullish on companies using Obsidian for knowledge management and AI driven workflows. It's pretty reasonable to build custom plugins for a specific vertical.
I once used Notion at work and for personal note taking. I'd never felt it was "slow." Until later I moved my notes to Obsidian. Now when I have to use Notion at my job it feels sluggish.