I now strongly suspect the swap file, thanks for your help!


> 
> It may also be an access or size limited Windows Swap File.  If you do not
> have administrator permissions these settings cannot be changed.  However,
> if you do have admin privelages, Right click My Computer. Click Properties.
> Go to the Advanced tab and select Performance Options.  By clicking Change,
> you can set new size limits for Windows memory paging or swapping.
> 

> 
> It will require more memory because each super-sampled pixel would be
> preserved so that future neighboring pixels don't need to re-shoot that that
> location.  Storing this may significantly increase memory usage. (perhaps 4x
> or more!)
>

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