Running WPMU makes a big difference as the performance hit from one blog is exponentially raised as it’s applied to a network of WPMU blogs … so if your blog’s slow down or spike is only 10% … which is fine … it affects my network over 300%, which is horrible.
Regardless of whether or not the code is “used” it still has to be executed, which many PHP programmers know, often takes more time then the execution itself.
So the compile time + memory trade off (nearly 300K of RAM per blog) was enough for me to scrap it and once I did, the results were clear, it was a hog and a half.
PS – I still use UTW on my personal blog. 😉
Without opening it up and running Xdebug on it — I was able to see a 300% performance increase after disabling the plugin.
While the plugin was enabled I was constantly getting script timeouts reported by PHP.
The thing’s a beast, at 4500+ lines of code, it’s a beast of a plugin.
UTW was discussed on WP-Hackers in the recent past, here’s the link:
http://www.nabble.com/Thoughts-on-Ultimate-Tag-Warrior-t2208029.html
