I suppose your device is too slow for the frequent updates, but I’m also surprised no one else has reported it. Do you get this problem only while a sync is running, or also when Syncthing is idle? And is the CPU usage caused by Syncthing itself, or by the android wrapper?
I suppose we should just change the update interval to 2 seconds. But I’m not sure what the best value is, and I’d rather not add another preference.