synchronous call from RFC adapter

Hi,

we are making a synchronous RFC calls in a loop within the ParForEach block of the BPM. Each synchronous call is taking about 20 seconds from BPM, but the same RFC when executed directly on the SRM system takes about 20 milliseconds. Is this the desired behaviour of the RFC adapter or is there anyway we can improve this ?. Also please let me know if the RFC adapter suppots connection pooling to improve the performance ?

Regards

Anand