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You could set the environment variable G4_NO_VERBOSE in the hopes of improving performance, though to date those improvements have not fully materialized, in fact as of G4 version 8.0.p01, a code modification is required to prevent the setting of G4_NO_VERBOSE from skipping important code in G4. Tracy has patched this and it is included in our 8.0.p01-gl4 version of G4.
We also set G4_STORE_TRAJECTORY
Make sure to install the header files into a single common directory.
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libG4visualizations is the product of Riccardo's addition to the CMT requirements file: http://www.fisica.uniud.it/~glast/MRStudio/Geant4vis.html
libG4g3tog4 is natively called libG4G3toG4