I also notice Estuary skin seems slightly slugish on my rpi2, and (abit less) on my rpi3. Its not extreme but enough to notice. I tried Confluence which reduced the slugishness but finally switched to Amber which seems to be even more responsive. Watching the Pi's through TOP seems to verify lower CPU load. Im not claiming Estuary is unusable but it is not very 'snappy' in my setups, enough that some users may also want to try other skins.