OCEAN "jobs" grinds to near halt....

I have an OCEAN script in a BIG for-loop that submits many jobs -
looks a bit like this:

foreach( corner process
foreach( vdd voltage
foreach( ctemp temperature
foreach( vicm list(0.05 0.5 0.85 1.3)
foreach( prc par

/* other stuff going on */

jobs=cons( run(?jobName job ?queue
"hspice") jobs)

)))))


It all works fine and the HSPICE Q has about six jobs running at any
one time (jobs are short - two minutes)......BUT after a while (maybe
150 or so jobs) - the whole thing grinds nearly to a halt. I only see
ONE job on the Q at any one time ????

Any ideas please.....at a complete loss.

Thanks.

--
Phil