I still find notion too slow for some reason although it has improved over the last year for me. Kudos to the guys though. Great story. Notion definitely has growing feature list. Now it has API, backlinking etc.
Speed is the number 1 most reported customer feedback (from what I've read), and I share the concern. As a result they made that their no. 1 priority; they did recently make some significant improvements but I still personally find it too slow in many cases, especially since I'm trying to replace Notational Velocity, which was designed very specifically to be as fast as physically possible. Until Notion deploys native apps and further improves caching it's still going to feel slow to me :/
#1 geared towards speed and simplicity - the one you reach for first when you just want to jot something down without thinking too much about it.
#2 geared towards organization and power - this is more like a wiki - more structured, organized, and thoughtful.
From time to time, you can pull important information out of #1 and put it in #2 in a much more structured/formatted/organized way.
This 2-tier system has worked the best for me and I no longer have to keep looking for the one app that will magically do it all (I don't think it's possible). I use Apple Notes for #1 and Notion for #2.
One of our engineers made a Siri voice command for this using the built-in iOS Shortcuts a few weeks ago; maybe give Shortcuts a look? Might be less trouble than opening Xcode.