numthreads

Properties:

Where it can be set: In the URL or in a Properties Object
Possible Values: Integer (representing the number of threads)
Default: 4

Comments:

You should set this value to the number of threads you expect to access the XDB Server at the same time, for optimum performance.

If you set numthreads too high, your application will drain system resources. If you set numthreads too low, your application performance will drop.