I found a fix was to put the individual shapes onto containers. It seemed as if you could do the animations with just the raw shape but saving the room would loose the animation. Only way I found to fix it was to put the shape into a container so the animations is moving the separate containers instead. Might not help you but thought I would at least let you know incase it might be that that is the cause
Unsure if it was anything lately that was updated on RecRoom, but use of many rotators in a Rooms 2.0 room causes heavy lag for players who are not the authority of the rotator. When networking stutters or lags, the FPS of the room is perfect, but when networking catches up to show the realtime rotator rotation, other players drop FPS badly.
Grabbing out the makerpen still lags all the other players in the room, bummer this hasn’t been solved.