I'm not sure for other servers since I haven't been on them for a while but every time there is a x2 event in Reboot the game becomes unplayable due to the immense lag. The exp gain is arguably worse since it heavily increases chances of us dying.
This game is notorious for failing to invest in its servers compared to the amount of money it makes. So either upgrade the servers or please just drop x2 events all together because at this point they aren't really "events".