Simon, I'm approaching this methodically, as you are suggesting. I re-ran the program with -hc again and got the following. I suppose it tells me that I need to investigate launchScripts#8. COST CENTRE MODULE %time %alloc launchScripts#8 Main 85.7 86.0 takeEmptySeat#8 Snippets 8.0 7.0 CAF Main 4.1 5.9 {-# SCC "launchScripts#8" #-}launch host $ script (bot, bot, affid) I added some strictness and ran again {-# SCC "launchScripts#8" #-}launch host $! script (bot, bot, affid) COST CENTRE MODULE %time %alloc launchScripts#8 Main 81.0 81.6 takeEmptySeat#8 Snippets 12.1 9.2 CAF Main 5.1 8.3 Did $! make a difference of 4%? I'm running -hy -hclaunchScripts#8 now. I ran ./randomplay +RTS -p -hy -hclaunchScripts#8, results at http:// wagerlabs.com/randomplay1.tgz results from -hc -hclaunchScripts#8 at http://wagerlabs.com/randomplay2.tgz COST CENTRE MODULE %time %alloc launchScripts#8 Main 92.1 92.0 takeEmptySeat#8 Snippets 4.3 5.1 CAF Main 2.1 1.9 What do the "by type" (-hy) results tell you and how should I proceed? Thanks, Joel -- http://wagerlabs.com/