Someone asked how it holds up with a long post and large images, so I made a sample: https://bloffy.bloffy.blog/en/a-heavy-post-long-text-and-lar...

And here's the PageSpeed Insights result: https://pagespeed.web.dev/analysis/https-bloffy-bloffy-blog-...

It's a long post with lots of images in different sizes, plus diagrams and math.

Images uploaded in the editor get a srcset with 4 widths, and the CDN compresses them to suit each browser. Since we know each image's original width and height, the layout doesn't shift.

Diagrams and math are rendered to SVG and MathML when you publish, so readers can load them quite fast.

I actually wanted to talk about this too, so I'm glad I got the chance to answer. Thanks.

(The SEO score there is low only because the sample blog is noindexed.)