Truth of the matter is, Exporter can get called a lot. Dprof seems to produce a minimal time of 0.0010 for the time something takes.

A program I use uses hundreds of modules, adding up to 135 calls. 135 * 0.001 == 0.130.. which is 10% for me. Truth of the matter is, it's 135 calls. If you can make your system heavily loaded so you can see how things scale, then you may see Exporter go down to a minimal amount.