It's indeed intended as a print (300-600dpi).
And the final size maybe at 1/4 of that. Even at 1/4, I have a hard time spanning around. :P And I bet you can guess how much it lags at full size!
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Computer specs:
CPU: Intel Celeron M 450MHz
RAM: 1GB DDR2 100MHz
Storage: 4GB SSD + 8GB SDHC
Monitor: 7" LCD WVGA 800x480
OS: Windows XP Professional w/ SP3
Road warrior operation duration: 4h30m! (extendable to 6h30m!) 