Spectral Imaging (Peter Watje) has released an update to his Particle+ plugin;
“Ver 2.01 Adds a fast update check box. When this is on, the particle does not reintegrate from the start. Instead it only integrates froms the last frame. This is useful for when you are working on setting gravities params or particle params while playing. To see how this works create a fairly complex system, hit play and start adjusting the parameters(other than the particle count which will cause a rebuild always). If the fast update is off notice how you get long pauses between adjustments since the particle system is rebuilding from scratch. If the fast update is on, it will only rebuild from the last frame, with the result being better interaction but the system will not be precise.”
Download Particle+ 2.01