How to change PHP 5 Handler from suphp to fcgi in WHM (Linux hosting)
1) Login to WHM
2) Proceed to the Search Panel on the left and type in "php" and choose on "Configure PHP and suEXEC" below the "Service Configuration"
3) Proceed to "Alter Configuration" and for the option "PHP 5 Handler" change the php 5 handler from suphp to fcgi
4) Select on "Save New Configuration"
FCGI actually attempts to lower the overhead of interfacing Apache with CGI programs. This allows the server to serve web pages quicker and in higher volume.
For further reference about the advantages of FCGI over suphp, you may refer to the below URL:
http://docs.cpanel.net/twiki/bin/view/AllDocumentation/WHMDocs/MorePhphandlers