I can’t reproduce this, at least I wouldn’t call the drop noticeable. With twenty-three apps running, including heavy hitters like the browser, camera, maps and several heavy Android apps, the frame counter only shows a quick red spike when you move from Home to Events or the other way around, but this isn’t visible to the eye, and the counter stays at 60 unless you switch back and forth between Home and Events multiple times per second. Compared to my Xperia 10 II, which is only running four apps because it keeps kicking everything else out of memory (even though I doubt those four measly apps are really using up all of its 4GB of RAM), yet shows a constant stream of red spikes and hovers around 58 fps even just idling on Home. The Xperia 10 II never goes above 50 fps inside the Settings app, whereas the C2 shows 60 fps throughout.
I can’t compare with the Xperia 10 III, but to me this feels just as smooth as the original Jolla Phone. I think the problems with slowness and lag many are experiencing are caused by a few bugs that don’t always show up (like this) and not so much the phone itself, because otherwise it wouldn’t make any sense that my C2 is almost perfectly smooth and responsive.