The FixClasspathConfigurator configurator has been introduced to solve https://issues.sonatype.org/browse/MNGECLIPSE-2433.
The issue happens with a mavenized seam 2 project that has a flat layout structure.
This configurator refreshes the old maven facade causing m2e to solve dependencies twice when ever building a project.
It is the configurator for maven-compiler-plugin so it is called for every Java project.
Since solving dependencies can take a long, it can slow down building projects up to 15% (depends on the project's dependencies)

The solution:

• removing the configurator. The issue is only related to the mavenized Seam projects that aren't included into project examples anymore and a required classpath entry can be manually added(newer m2 versions won't remove the existing classpath entry).