Polygon removal results in lag

[kwrk85]

Could anyone please give me explanation why Peach is glitched up after you remove a polygon from a Clean Peach model? I have followed Stickman's tutorial and used HxD to remove Peach's crown and for some reason, when I load the game, it starts lagging (and it continues all the way to the result screen) and the model is completly invisible except for the eyes. What am I doing wrong? Someone please help.

[DrPanda]

Hex out the vertices instead of the polygon... that usually clears up the problem