Agree 100% with JK. Our 6.5M tops out at about 46-49 knots. Anything above 40 knots and the rules are to do everything slowly, unless you are executing a crash stop.
A hard turn - making sure crew are aware and holding on - at say 45 knots is fine on Farfetched unless you are trimmed out when she sort of skids which is a loss of control and hence scary. Trimmed in, while we have wondered if we are going over (but that is an illusion) the G forces do pile on.
In unpleasant Solent chop executing a hard turn can feel a bit unstable with some bouncing so we always throttle back to sub 30 knots.
Biggest danger for us is hitting wake from a big ship in dead calm at an angle when you sometimes just can't see it!!!! That is a good way to get teeth through lip syndrome.
At low or high speed, 99% of the time the rule is "do everything slowly". But I would suggest practicing the crash stop and of course MOB.