Smooth Scrolling?

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Shambler

I've narrowed it down , all variables are ints and I have tried forcing vsync on / off and application preference in the driver.

The scrolling is as smooth as I can get if my mainloop is this

While Not KeyHit(KEY_ESCAPE)
'Automatic scroll
pos=pos+direction

If pos=0 Or pos=256 Then direction=-direction

map.draw(pos,pos)

Flip

Wend

But as soon as I control the scrolling with keypresses the scrolling keeps stopping intermittently for a split second at random intervals...

While Not KeyHit(KEY_ESCAPE)
'Using keys
If KeyDown(KEY_LEFT) Then pos=pos+1
If KeyDown(KEY_RIGHT) Then pos=pos-1

map.draw(pos,pos)

Flip

Wend

Could there be some sort of latency or mis-reading of the keyboard going on here?

[Edit] And I've just noticed that in the automatic scrolling example, if I press keys on the keyboard this too makes the scrolling 'hiccup' for a split second.