I've had a few grumbles about mobile sync, and a few about the spot healing brush. This is one about both at the same time!
I was editing some photos which have already been synced to LR Mobile, so I assume that all that is being synced is the xmp file, but the spot healing brush became almost unusable, with the cursor jumping over the screen and creating lines instead of spots. As soon as I paused sync, the brush worked normally. Lightroom mobile sync seems to be very inefficient with resources - or is it just me?