does upgrade cause slowdown?

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I am a webmaster of a website and the server maintianers upgraded from
php 4 to php 5.At around the same time my site slowed down.Does a php
upgrade cause a site to slow down?Is there any way in which I can find
out why my site slowed down?

Re: does upgrade cause slowdown?

Heya, PC.

Upgrading from PHP 4 to 5 is a pretty BIG change; in some ways, your
app will run more efficiently, but more likely, PHP is running in
emulation mode.  For example, classes written for PHP 4 are less
efficient than PHP 5 classes.

To complete your migration, you'll need to rewrite your app for PHP 5:

Re: does upgrade cause slowdown?

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Responding to OP's request, here is a great
resource for tuning web sites with LAMP/PHP in mind:

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