Timing movements in seconds?

Instead of moving the object every 250 milliseconds, you need to move the object based on the number of miilisecs since the last update. Like this:

; Set 3D graphics mode
Graphics3D 640,480,16,0
SetBuffer BackBuffer()

camera=CreateCamera()
light=CreateLight()

cone=CreateCone( 32 )
PositionEntity cone,-3,0,5

distance#     = 6.5 ;blitz units
time#         = 3.0 ;seconds
speed#        = Float(distance / time);result is blitz units per second
speedpertick# = Float(speed#/1000);result is blitz units per tick

currentpos# = 0.0 

clock = MilliSecs()
starttime = clock


While Not KeyDown( 1 )
	
	ticks = MilliSecs() - clock
	clock = MilliSecs()

	If (currentpos < distance)
		distancemovedthisupdate# = speedpertick# * ticks
		MoveEntity(cone, distancemovedthisupdate, 0, 0)
		currentpos = currentpos + distancemovedthisupdate
	Else
		Text 2, 60, "Took " + (MilliSecs() - StartTime) + " milliseconds"
		Flip
		WaitKey
		End
	End If
		
	UpdateWorld()
	RenderWorld()
		
	Text 2, 5, CurrentTime$()
	Text 2, 30, currentpos

	Flip
	
Wend

ClearWorld()

End

That way it always moves at the same speed regardless of the framerate.

Edit: sorry, I didn't notice the significance of currentpos at first :-)

Edit: also, it'll never be *exactly* 6.5 units, or 3000 milliseconds because of the vagaries of PC performance, (my PC was doing a frame about every 17 milliseconds, which just doesn't divide cleanly into 3000) but it should be accurate enough for most purposes.