Hi matthew I'm checking your http://code.google.com/p/pharo/issues/detail?id=235&colspec=ID%20Type%20Stat... "Adding the ivar 'category' to methodReference allows a 25% speedup in Monticello snapshotting, after source caching. This capability is exploited as of PackageInfo-Base-mtf.56" for 10092 now. http://code.google.com/p/pharo/issues/detail?id=235&colspec=ID%20Type%20Stat... Several questions - I do not know what you mean by PackageInfo-Base-mtf.56? Where is it? Is this package uses your setter method category:? - why the category and category: methods are not in the *monticello extension? (There were in *monticello in 10091) - When I categorized them in *monticello I got problems or my network is really gettiong slow. Stef