Hey Andrew, have you considered running the data crunching on a Virtual Private Server? $25 per month at Gandi, Amazon Web Services, or Azure, gets you at least a dedicated core and massive bandwidth which might be enough to take the load off your local PC and internet connection. (Of course, I suggest this in complete ignorance of the requirements to run the site... it might need more CPU cores or RAM, so the price might be higher.)
Either way, with worldwide usage and such an innovative site, if you can't cover your costs no one could fault you for considering a freemium model - the site coastalwatch.com.au provides surf predictions for a couple of days in advance for free, but people need to pay ($80 per year) to get the more long range forecasts.
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