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Originally Posted by Jon
While this makes for less work, it should be noted that it's a huge amount of overhead, particularily with an intensive function like preg_replace, and likely will effect performance significantly.
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It actually doesn't have much of an affect on performance. I implemented a stripped down version of this mod so it works pretty similar to DSEFU. I'm now doing some profiling of X-Cart using XDebug to find where the most time is spent and I'm not seeing a noticeable difference in execution time with or without the output filter doing preg_replace on the URL's.