Found all instances of methods where split() is used without any local variables and added a local variable -- see http://snurl.com/21zf8. My own testing showed that this caused memory growth to level off at a reasonable level. Note that the link above says the problem is only with class methods, but my own testing showed that it's any method that meets these criteria. This is not a functional change, but should hopefully be the last nail in the coffin of #1131.