Increased CPU usage in indexers after installing Splunk for Unix/Linux add-on app,CPU Usage increase after installing Splunk App for Unix and Linux add-on in Splunk indexers?

Hi. The Splunk for Unix/Linux add-on app includes a transforms.conf with a lot of regexps. After I installed this in my indexers, CPU usage for regexpreplacement has doubled. Are all these transformations/regexps applied to all incoming events? is that correct? I use a very small subset of this app, it sounds like a waste of resources to have all those regexps applied to all incoming events. Thanks.