Seaside FAQ: Reduce Memory Size Of Running Image

Here's how to reduce the memory (RAM) consumption of an image after it has run for a while.

WARegistry clearAllHandlers. "Doing this will boot users out of their sessions"
MCFileBasedRepository flushAllCaches.
Smalltalk garbageCollect.

-Courtesy of Dmitry Dorofeev, Yanni Chiu, Avi Bryant, etc