Someone posted recently on the golang subreddit that they are building a collaboration tool with performance being the priority: https://www.superthread.com/
I am not affiliated with them and haven’t tried it out, but it fits perfectly in this discussion.
I’d love advice too - I’ve become heavily reliant on Notion’s database-lite features, which is what a lot of the markdown-based apps don’t invest in by default. I’m beginning to get frustrated with loading speeds that feel like spinning disks.
I tried Coda a few months ago. The feature set was very appealing. Coda turned out to be slower and more buggy than Notion, especially when routinely working with databases. The typography and graphic design were also less polished. I kept using Coda until I could no longer tolerate its issues and then have moved everything to Notion.
I work at Coda and would love to hear more about your experience. We are focused on our tables and formulas and I am surprised to hear that you had such a bad time with them. Feel free to reach out at gleb at coda dot io.