Yui holds less in memory

One scripted session on the simulator: five agents with 486-message threads, galleries, decks, games and full screens. Peak memory fell from 243 MB to 203 MB and launch from 137 MB to 124 MB, and the session ends with no new leaks, down from about 1,550 leaked objects. The same session runs before every release now and fails on a new leak or a peak over 300 MB.

say "Memory in one long session, before and after build 155."
stat 203MB "Peak memory" delta=-40 good=down sub="was 243 MB"
stat 124MB "At launch" delta=-13 good=down sub="was 137 MB"
stat 0 "New leaks" delta=-1550 good=down sub="was about 1,550 objects"
chart bar "Memory in MB" x=Launch|Peak y=137|243 y2=124|203 names=Before|After unit=MB