My server: CentOS 5.4 x86_64 4GB RAM Intel(R) Core(TM)2 Quad CPU Q6600 @ 2.40GHz After upgrade Plesk from 9.2.3 to 9.3, in 24 hours the RAM was at 99% and SWAP (4 GB) was at 100%. So I rebooted the system and after RAM is 25% and SWAP 0% used. Some hours after the used RAM is growing slowly, now it is in 50%. I think I have to reboot again tomorrow. I search for process eating RAM or CPU, but I don't find it.