[rjn945]

Yeah, I had a similar concern but it's just a confusion from thinking that every peer has to be equally powerful (i.e. all weak) and has to run on the end-user's computer.

If you performed this type of calculation before with a traditional database, you had to have a powerful enough to computer to perform the calculation. In this model, you would still have that computer; it's just now a "peer".

If millions of people want the same piece of data that requires a huge calculation to get, then you would set up one powerful machine of your own just to do this calculation and then write the result to the database, so the many "thin" peers can just read the result.