Why is this demo so fast?

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BlackD

Something I don't quite understand. This demo renders over 200,000 textured polys on screen, yet I'm still maxing out my FPS. How come this is so fast, yet other programs I make with more than a few thousand polys on screen (characters, terrain, etc) crawl along at ~60?

Open in online IDE

Graphics3D 800,600
camera=CreateCamera()
light=CreateLight()
Global FrameTime,Period,timer,fpscount,fpstemp,fps,fx,fynum=500
num=250
tex=CreateTexture(256,256)
SetBuffer TextureBuffer(tex)
	Color 0,0,250
	Rect 0,0,256,256,1
	SetBuffer BackBuffer()
Dim cubes(num)
For i = 1 To num
cubes(i)=CreateSphere(16)
PositionEntity cubes(i),0,0,15
EntityTexture cubes(i),tex
Next
Color 255,255,255
While Not KeyHit(1)
For i = 1 To num
	x#=Rnd(-1,1)/10
	y#=Rnd(-1,1)/10
	z#=Rnd(-1,1)/10
	MoveEntity cubes(i),x#,y#,z#
	Next
RenderWorld
fps 0,0
Text 0,15,"Polys OnScreen: "+TrisRendered()
Flip
Wend
End


Function fps(fx,fy)
fpscount=fpscount+1
If MilliSecs()<timer+1000
Else
	fps=fpscount-fpstemp
	fpstemp=fpscount
	timer=MilliSecs()
EndIf
Text x,y,"FPS: "+fps
End Function

+BlackD