I have quite a problem.
Scripts (silktest and workbench) are performing perfectly when execute them from SilkTest or Workbench, when executed from execution server the performance is really slow, i.e. in SilkTest opening text file from web takes 1-2 sec, the same operation on execution server takes 5-70 sec. similar thing is for the workbench scripts.
Execution Server act as a process started by the same user that is testing scripts in SilkTest/Workbench and ther are no proxy servers and even box for ES is the same as it act as ES and it have SilkTest/Workbench installed.