Click the objects to explode them. Use the buttons to switch between test scenes or use the 'R' key to reload the current scene. There may be a delay after your first click before the first explosion starts (and again before the first explosion on the Full Physics test scene) — those are caused by WebGL loading parts of the Unity engine the first time they're used and don't happen in standalone builds. Reload the scene to see the normal performance. Mesh Explosion is available now on the Unity Asset Store.