I dont put in numericping or particles10000. I load them once I'm in the game if i need them.particles is good for finding leaks (which are nonexistant in my maps). Just use -dev -console and type in numericping and particles10000 when you need them! There are also more commands like that. For example, if you have a really laggy map, type r_speeds (or something like that, im not entirely sure cos I map for SP, not MP!) and it will show you the details and framerates and stuff. Oh, and also, when you have a leak, type in pointfile and particles10000 as that will lead you to the leak!
Hope that helped!