I've successfully improved my GeoGebra problem response times by removing both the `archive => "geogebra.jar"` and the `codebase => findAppletCodebase("geogebra.jar")` lines from my GeogebraWebApplet creation code.
Give this a try and post back whether or not it helped... because if it is the case, we'll want to update our documentation to similarly remove these lines from the recommended GeoGebra template code.
I just checked a few of our locally authored problems.
Right now GeoGebra applets are loading reasonably quickly, so it's hard to get a good comparison.
There is no speedup from commenting out those lines, but on the other hand, removing them doesn't seem to affect the question in any way.