[markstock]

One of the nice aspects of Stable Fluids is that you don't need to iterate the pressure correction terms to convergence. Just run a fixed number of Jacobi or Gauss-Seidel sweeps and keep performance consistent. The only drawback of this is some mass loss in areas, which for the present purposes is acceptable.

[markstock]

I should add that this is a major "tell" for detecting when an app uses the Stable Fluids method: obvious mass loss (and very viscous, energy-dissipating flow).