How much BHP, petrol/diesel? Weight distribution? Lots of things affect performance. I had weed wrapped on the outdrive which stopped me getting on the plane and it was no more than a large handful.
Over the years the boat got loadded with more an more kit. Wet suits ringo's and water toys, tender 2 outboards??? and load of other stuff. I drank the beer and had a good sort out. I reckon that I've added five knots of lost topend....