In reply to Jan Klaverstijn.

Jan,
I'm glad that you were able to tune your environment.
MBD_SLEEP_TIME accepts only one value and, as you have witnessed, it affects how fast jobs are dispatched.
Another parameter that influences SAS Enterprise Guide is MBD_REFRESH_TIME and this accepts two values. I think this is the one you set to "10 1". MBD_REFRESH_TIME influences how often client software is informed that a job has actually been started. By default its value is "60" , which is equivalent to "60 10". The second value is the one that impacts us. The default value would mean that, even if a workspace server is started immediately, LSF does not notify SAS Enterprise Guide for 10 seconds, so the client keeps waiting.
You can find a very detailed description of each parameter in the official documentation available at http://support.sas.com/rnd/scalability/platform/index.html. Look for the "Platform LSF Configuration Reference" corresponding to the software release that you have.
Edoardo