Cleaned out old, commented out rendering code. Simulation runs @ 26 FPS with 1000 particles.
Finished rendering and gravity code, and optimised simulation somewhat at the cost of realism. Still need to test for performance on older devices, add multithreading (because even though it was slower on my last trial, that device was apparently single-core), and see if I can optimise findNeighbors. Next step after that is to add menus, options, music, etc.