Fast process start of form

Obviously, you are doing lots of things when starting a process other than just creating the form you want. In order to reduce the time that takes, have a look at what your process is doing on startup. The unavoidable overhead of loading a new process and the .Net Framework is minimal (certainly not more than one second) if the Framework is already in memory, as it should be, so there is at least four seconds' worth of stuff being done in addition to this form being created.

If there are heavy components that can be late-loaded (i.e. in a Form.Load event or separate thread that is spawned after the main form is loaded), look into that. It will increase the complexity of your solution, of course, so it is a tradeoff, and it will still take 6 seconds until the full functionality is available (anything that needs those components can't work until they're there). But it can help in getting something displayed to the user faster.