OK .... Mr X beat me to it, but I did not read his post thoroughly
I did not mean to step on your feet man
(setting it to anything lower than 10 will cause the system to use unnecessary resources, as it looks for the oldest entries to delete - unless you have a 4.2 Ghz dual processor machine, I would not suggest it. 10MB has been a "known secret number" amongst techies for along time)