Hi Philippe,
I faced similar issue with JAVA service.
I did couple of things and it started working fine. (Increased the memory for Designer & Increased memory of my machine to 8GB)
How much is the memory allocation to Designer? Also what is the RAM size of the system on which you have installed the components?
Regards,
Syed Faraz Ahmed
#Integration-Server-and-ESB#webMethods#webMethods-General