I recently installed PHP-mode (the version with "Modified: 2008-11-04", with the manual for "1.5.0").
Since then the Emacs uses up to 100% CPU when viewing/editing an PHP file. (It usually starts at a low value like 20% and goes up, sometimes a bit down for a while, depending on the other programs I have.)
A sample file is this one:
But even an empty file shows the same symptoms, or the files I regularily work on.
This is mostly when such a PHP file is in the active buffer, but sometimes also when it is more back in the buffer list. killing the buffer solves the problem, as sometimes also does burying the buffer.
This should not be this way, I think.
Here is my Emacs-info:
GNU Emacs 22.3.1 (i586-suse-linux-gnu, X toolkit, Xaw3d scroll bars)
of 2008-12-03 on build19