Surfaces?

OK pls answer this (if you can)....

I create a cube like this...

Function map_create_brick_template()

	brush_wall    = LoadBrush(Pak(g_game_textures[1]\texture$),49 ) 
	brush_ceiling = LoadBrush(Pak(g_game_textures[1]\texture$),49 ) 
	brush_floor   = LoadBrush(Pak(g_game_textures[1]\texture$),49 ) 
		
	; Prepare the mesh
	mesh = CreateMesh() 	
	surf = CreateSurface(mesh,brush_wall) 
	;front face 
	v0 = AddVertex(surf,-1,+1,-1,0,0)
	v1 = AddVertex(surf,+1,+1,-1,1,0)
	v2 = AddVertex(surf,+1,-1,-1,1,1)
	v3 = AddVertex(surf,-1,-1,-1,0,1) 
	AddTriangle surf,v0,v1,v2
	AddTriangle surf,v0,v2,v3 

	;right face 
	v0 = AddVertex(surf,+1,+1,-1,0,0)
	v1 = AddVertex(surf,+1,+1,+1,1,0) 
	v2 = AddVertex(surf,+1,-1,+1,1,1)
	v3 = AddVertex(surf,+1,-1,-1,0,1)
	AddTriangle surf,v0,v1,v2
	AddTriangle surf,v0,v2,v3 

	;back face 
	v0 = AddVertex(surf,+1,+1,+1,0,0)
	v1 = AddVertex(surf,-1,+1,+1,1,0) 
	v2 = AddVertex(surf,-1,-1,+1,1,1)
	v3 = AddVertex(surf,+1,-1,+1,0,1) 
	AddTriangle surf,v0,v1,v2
	AddTriangle surf,v0,v2,v3 

	;left face 
	v0 = AddVertex(surf,-1,+1,+1,0,0)
	v1 = AddVertex(surf,-1,+1,-1,1,0) 
	v2 = AddVertex(surf,-1,-1,-1,1,1)
	v3 = AddVertex(surf,-1,-1,+1,0,1) 
	AddTriangle surf,v0,v1,v2
	AddTriangle surf,v0,v2,v3 

	surf1 = CreateSurface(mesh,brush_floor) 

	;bottom face 
	v0 = AddVertex(surf1,-1,+1,+1,0,1)
	v1 = AddVertex(surf1,+1,+1,+1,0,0) 
	v2 = AddVertex(surf1,+1,+1,-1,1,0)
	v3 = AddVertex(surf1,-1,+1,-1,1,1) 
	AddTriangle surf1,v0,v1,v2
	AddTriangle surf1,v0,v2,v3 

	surf2 = CreateSurface(mesh,brush_ceiling) 

	;top face 
	v0 = AddVertex(surf2,-1,-1,-1,1,0)
	v1 = AddVertex(surf2,+1,-1,-1,1,1) 
	v2 = AddVertex(surf2,+1,-1,+1,0,1)
	v3 = AddVertex(surf2,-1,-1,+1,0,0) 
	AddTriangle surf2,v0,v1,v2
	AddTriangle surf2,v0,v2,v3 
  
   ; free up the brushes
   FreeBrush brush_floor
   FreeBrush brush_ceiling
   FreeBrush brush_wall
	
   UpdateNormals mesh	
	Return mesh

End Function

Then I do this...

brick_template=map_create_brick_template()

	ScaleEntity brick_template,2,2,2
	EntityBox brick_template, -2, -2, -2, 4, 4, 4
	EntityPickMode brick_template,2
	EntityFX brick_template, 1
	
	; Now lets create the maze structure...
	For x = 1 To g_game_mazesize
		For y = 1 To g_game_mazesize
			For z = 1 To g_game_mazesize
				maze(x, y, z)\entity = CopyEntity(brick_template)
        		EntityType maze(x, y, z)\entity,g_game_collision_type_brick
		  		HideEntity maze(x, y, z)\entity	
				PositionEntity maze(x, y, z)\entity,x*4,y*4,z*4
	  		Next
 		Next
	Next
  
	FreeEntity brick_template

Now, if I create a map of 22*22*22 blocks all is fine the FPS is great however at 25*25*25 the FPS goes to 1!

So the question is what is causing the slow down and how to prevent it?

How many surfaces do I have it I create a map of 5*5*5 say based on the above code and how many meshes are there? If copyentity doesn't copy the surface then a map of 5*5*5 would have 1 mesh, 3 surfaces and 625 entities.

I don't think it's the tris count thats causing the probem but the number of surfaces but perhaps it is the number of entities.

Each 'cube' should share a texture for the floor, wall and ceiling so in essence all i really need is 3 surfaces right?

How can I do this? I wonder what the entity limit is with blitz?