Performance mdbox vs mbox

If I do the same test[1] with mbox I can store around 31k messages and mdbox 16k messages. I noticed also that cpu and disk utilization with mdbox was not very high, while disk utilization on mbox was much higher. That makes me wonder if I can tune mdbox to have better performance?

[1] imaptest - append=100,0 logout=0 host=svr port=143 user=test pass=xxx seed=100 secs=240 clients=1 mbox=64kb.mbox box=inbox/test

[2] mail_location = mbox:~/mail:INBOX=/var/spool/mail/%u:CONTROL=~/mail/control:INDEX=/var/d ovecot/%u/index:LAYOUT=maildir++ mail_location = mdbox:~/mdbox:INDEX=/home/popindex/%u/index

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