This is after enabling cache write, run just now with other people in work, yesterday it was just me, test_copy2 has improved hugely:

Job: Test_Copy0
Run Time: 12/03/2012 11:27:23 to 12/03/2012 11:33:32 (Duration: 6:10)
Status: Completed Successfully
Files Processed: 4,517
Files Copied: 4,514
Folders Processed: 344
Bytes Copied: 1,863,431,279
Bytes per Second: 5,039,910

Job: Test_Copy1
Run Time: 12/03/2012 11:33:32 to 12/03/2012 11:35:29 (Duration: 1:57)
Status: Completed Successfully
Files Processed: 1
Files Copied: 1
Folders Processed: 1
Bytes Copied: 1,523,321,591
Bytes per Second: 13,026,746

Job: Test_Copy2
Run Time: 12/03/2012 11:35:29 to 12/03/2012 11:36:43 (Duration: 1:14)
Status: Completed Successfully
Files Processed: 1
Files Copied: 1
Folders Processed: 1
Bytes Copied: 1,523,321,591
Bytes per Second: 20,637,579