phranque - 2:41 pm on Mar 7, 2013 (gmt 0)
it may be the behavior of the specific handler that is processing the cgi script that is buffering.
it may also be caused by another apache module in process.
for example if you are using mod_deflate, perhaps that module is buffering the output of the cgi module.
you might try disabling the data compression if that is enabled, or perhaps try another method of handling the perl script.