Hello,if whoever started this month to massively scrape the data from JOSM server reads this mailing list: STOP IT!
The "403 Forbidden" should have been enough to understand this is unwanted. Circumventing the blocks shows that you did not learn the lesson.
I have no problem with slow page crawlers, but spending the majority of our CPU power for one website downloader is beyond any acceptable standards.
Ciao -- http://www.dstoecker.eu/ (PGP key available)