Hi,
Again, our server has no bandwidth limits. In the several years of operation there has not been a single issue reported of a problem with the SERVER bandwidth. I can only assume the the slow bandwidth that you are experiencing has to do with your INTERNET CONNECTION at your particular location.
We do NOT support bulk downloading and this can cause slow response time in preparing the jobs to download. Jobs are deleted after 5 minutes and we have not yet had any complaints about this for regular use via the XyGrib software.
If you need to perform bulk downloads we kindly request that you do this directly from NOAA NOMADS server as they can support bulk requests. Once you download from this location you can open the gribs in XyGrib.
I'm sorry not to be able to help you beyond this.
David