Blitz3D Framework - IDEal, any good?

I was wondering if this frame work is good. I experianced flickering while using it, but that maybe because i don't use it properly. Also i sort of wondered why this is nessesary, why can't i just run a loop without doing all this? After all, why free CPU if we need it?

Graphics3D 640,480

Global Camera=CreateCamera ()

Const GameUPS=60 ; Updates per second
Local Period=1000/GameUPS 
Local FrameTime=MilliSecs()-Period

Local Tween#, Ticks,i,Remaining,StartTime,Elapsed

While Not KeyHit(1)
	
	StartTime = MilliSecs()
	
	Repeat
		Elapsed=MilliSecs()-FrameTime
	Until Elapsed
	
	Ticks=Elapsed / Period
	Tween=Float(Elapsed Mod Period)/Float(Period)
	
	For i=1 To Ticks
		FrameTime=FrameTime+Period
		If i=Ticks Then
			CaptureWorld
		End If
		UpdateGame()
		UpdateWorld
	Next
	RenderWorld Tween
	
	Remaining = Period - (MilliSecs() - StartTime)
	If Remaining > 1 Then 
		Delay (Remaining-1) ; Free some CPU time
	End If
	
	Flip
	
Wend

End

Function UpdateGame()
	; ...
End Function