It appears that you are using an AutoClicker for this
Please do not test latency with AutoClicker tools, as this messes up packet lining
This is pretty simply refuted by two facts:
1. I experience similar lag despite having ~35 ms ping and not using an auto-clicker; not as good as 18 ms but it should still be much faster than what I got on the live servers with 100+ ping. Currently, it's noticeably slower.
2. Back in the live servers, a player with ~5 ping used an auto-clicker to prof wands and managed to do 5 heals in under a quarter of a second, perhaps faster; 5 heals looked exactly like 1 heal to the naked eye. Clearly, at least in the original version of Mabinogi, clicking extremely fast did nothing to increase latency.