You should review your license agreement with your account team. Licenses are typically per-user (where a user at a different IP counts as a separate user), but there are also connection limits for each user (each 'job' is a new connection as long as it is still around), and exceeding them can cause one user/IP to consume many licenses. 

If creating processes is slow, it might be worth looking into using Job Servers. This is a pool of processes that wait to handle 'job' requests. 

This is likely an issue with the OS - it shouldn't take that long to create a new process. It might be worth gathering an OS-level trace of your process while you do this to narrow down where the time is spent. Depending on platform, the trace can be gathered with strace, truss, Windows process monitor, or others.