[Twisted-Python] CPU intensive threads

[Nathaniel Haggard]

Is there anything twisted can do about CPU intensive threads?

When I run a CPU intensive method via threads.deferToThread it takes
all the CPU away and renders the twisted process unresponsive.  The
perspective broker for example will not make any connections until the
CPU intensive methods finish.

Is there a way to set the priority of the main part of twisted so that
it can run CPU intensive threads and still service connections.

Thanks,  
Nate