If you have not already done so, you can enable Display Statistical Info from the
Options -> File System -> Advanced -> Other
tab. Information about performance from Each Object will be displayed in the session report. While it is not particularly organized, you should be able to put it together into a readable format
You can also obtain the session ID of a session showing poor performance, and run
omnidb -session [session_id] -detail Do not include the [ ] marks
Again, for each Object, it will show a start time, a Finish time, and teh amount of data backed up
As Daniel said, DP is not setup to give this information on particular machines, only for individual Objects
Finally, I don't know if this will give you what you want, but there is a resport called 'Session Statistics'
omnirpt -report session_statistics -timeframe [start] [duration] -datalist [backup specification]
So, to see session statistics for backups in the last 24 hours of the backup specification Daily Backup
omnirpt -report session_statistics -timeframe 24 24 -datalist "Daily Backup"
The " marks would be needed because the Backup specification name had a 'space' in it