The default pool setting for Spectrum Spatial is 1, which means it will only be able to handle 1 concurrent mapping and feature request at a time.
For production use, you must change the pool setting upwards.
Note: It is recommended to have at least 1 pool for each processor core and no more
than 2 pools per core. Hence, on an 8 core server you will set the minimum pool
settings to be 8 for the mapping component and also 8 for the feature
component.