The “Alternative PHP Cache” (APC) is a free and open opcode cache for PHP. It was designed to provide a free framework, open and robust for caching and optimizing PHP intermediate code. It is known that APC should normally be included an alternatively in php icon wink Alternative PHP Cache.
We should use it to optimize the access of portals, and it is true that the improvement is really important!
Here is a small howto explaining how to install an APC on debian with php4.
First you need to install PEAR
apt-get install apache2
apt-get install libapache2-mod-php4
apt-get install php-pear
apt-get install php4-dev
apt-get install make
pecl install apc