I've seen people say this a lot, and I have the exact opposite takeaway. Figma is one of the slowest and laggiest applications I've ever used and a shining example to me of why we need to stop building rich software experiences in web browsers.

On Linux + Firefox, basic navigation, like panning and zooming around in a file, is painfully laggy. In FigJam, try using the marker to draw any curved line--it updates at like 2 frames per second, which makes it completely unusable for handwriting text or drawing diagrams. Excalidraw, on the other hand, in the same browser, is perfectly lag-free.

Every time a designer sends me a Figma I just ask for exported images because using the website is an exercise in frustration. And don't even get me started on the impossible, spaghetti-on-an-infinite-canvas UX requiring endless zooming and dragging...