I worked at an org that used Confluence heavily and remember how long load times could get if the page was large. I was therefore pretty surprised to hear that

I worked at an org that used Confluence heavily and remember how long load times could get if the page was large. I was therefore pretty surprised to hear that Notion is apparently worse. I suspect a lot of the sluggishness with both programs is at least partially because they don't render much server side. Compare how slowly a .ipynb file loads on GitHub compared to Markdown.