Are you testing the new SSIS+ 1.6 Beta 2 or the previous version? The
Compression property will enable gzip compression of the CRM web services.
In the previous CRM 4.0 the compression was disabled by default because
most CRM servers were not setup to use compression. I think MS did correct
this for CRM 2011. Please give it a try. I would be interested to hear if
you see any performance gains when using it.