[Closed] extended helper problem

hey,
i am trying to create some custom helper objects, thats all working fine – i am extending the point helper. the problem is my fps vastly suffers even with simple meshes as the display mesh, if i use the same meshes not displayed as helpers i get 400fps, with the same mesh pluged into the
“on getdisplaymesh” handler in the extended plugin (i am using a createinstance of the mesh)
my fps drops to 25fps… its a big drop in performance

plugin Helper extendedhelper
   name:"extended helper" 
   classID:#(0x2c380442, 0x28853918)
   category:"test" 
   extends:point
   replaceUi:true
   	( 
   	local meshObj
   	
   	parameters testparams rollout:displayroll
   		(
   		Length type:#float default:1.0 animatable:false
   		Width  type:#float default:1.0 animatable:false
   		Height  type:#float default:1.0 animatable:false
   		displaymesh type:#boolean ui:chk_displaymesh default:true animatable:false
   		
   		on displaymesh set state do
   			(
   			if state == false then meshobj = trimesh()
   			if state == true then 
   				(
   				meshobj = createinstance box length:length width:width height:height
   				)--end if state
   			)--end on
   		)--end
   	rollout displayroll "test rollout"
   		(
   		checkbox chk_displaymesh "Display" default:true
   		)--end rollout
   		
   	on getDisplayMesh do 
   		(
   		if (meshObj == undefined) do 
   			(
   			meshobj = createinstance box  length:length width:width height:height 
   			)--end if
   		meshObj.mesh
   		)--end on
   		tool create 
   			( 
   			) --end create
   		)--end pluin

does anyone know why performance is so bad here?

cheers,
mark