when a bot or user visits a wiki’s SpecialNewFiles page, and some other pages like this page, missing thumbnails are created on the fly. this can potentially flood the server(s) with thumbnail creation jobs, which slow down the wiki or potentially bring down its ability to server web pages. GWToolset has the potential to create this situation when it uploads several large mediafiles at once @see http://lists.wikimedia.org/pipermail/glamtools/2014-May/000135.html.
during the zürich hackathon i spoke with aaron schultz, faiden liambotis, and brion vibber regarding approaches to dealing with this issue. in summary, the idea aaron came up with is to create initial thumbnails on download of the original mediafile to the wiki. this should block the appearance of the title on the new files page and anywhere else until the thumbnails and title creation/edit have completed. aaron thought, and faidon and i agree, that further throttling of gwtoolset will not help resolve the issue.
i am currently looking into implementing this approach and will use this bug to track activity on it.