Antun Balaz participated in the WLCG Collaboration Workshop, held from January 22 to January 25, 2007 at CERN. He gave a presentation on how to speed up and stabilise the CE as a part of the "Tutorial on how to solve most common problems at sites" during the WLCG Operations Workshop. The presentation summarized experiences, post deployment alterations, and tips and tricks that have been found over the many years of the CEs being in production. Main source of experiences presented is the deployment effort in the SEE-GRID, SEE-GRID-2 project, as well as in the EGEE-SEE ROC.