Why is there LoadPixmap and LoadPixmapPNG?

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tonyg

Running larger tests has more variety of responses which could suggest a problem with my testing.
9/10 times loadpixmappng is faster (for me). Admittedly between 1-60ms. Lower numbers of loads show a larger difference
e.g. 5 images show between 1-15ms difference... for me.
Please can some run/check/correct the following...

Graphics 640 , 480
GCCollect()
Local image:TImage
t1:Int=MilliSecs()
For x = 0 To 5
	image = LoadImage("max.png")
Next
t2:Int=MilliSecs()
GCCollect()
Print "loadimage done"
t3:Int=MilliSecs()
For x = 0 To 5
	image = LoadImage(LoadPixmapPNG("max.png"))
Next
t4 = MilliSecs()
Print "loadpixmap done"
Print t2 - t1
Print t4-t3

<edit> Scratch all that. They do seem the same if I load a dummy image first then run through the loops.
<edit2> In fact, scratch it all again. Getting some very odd results. Still suggests Loadpixmappng is slightly quicker but results vary too much to be sure.