The performance of Adobe Express for web is not ideal in my opinion. Zooming, panning and moving objects is lagging. I'm sure that making the canvas of Adobe Express more responsive will make the user experience feel better and faster for everyone. I assume that you as the expert know more than me on how to achieve this, but how about:

• Only re-rendering the design at full resolution when zoom is finished? I don't mind having a pixelated design for a fraction of a second as much as having to watch Express zoom into it even after i stopped the zoom gesture because it couldn't catch up with it.
• Caching bitmaps of every object and group of a design to improve responsiveness when moving and transforming objects? Re-render them only entirely when moving or scaling is finished or after a certain interval?
• Porting some tricks of photoshop for web? It seems to me that photoshop for web is more responsive at least for zooming and panning. Or maybe even take over some concepts used in figma?
• Considering a rewrite that uses HTML objects instead of WebGL? At least for Canva HTML-based seems to work pretty good. Their editor feels much faster than yours. Okay, this seems like a bad idea, but it would probably make implementing in-canvas text editing much easier…

I hope that my semi-knowledge based ideas aren't too bad and that you do something to make Adobe Express feel more like "express" soon.