Drowning in detail?
Focus your attention on the Top and Bottom performers.
Instead of Viewing All of your Items or Customers keep an eye on the Top 10 or 20, maybe even drop the Bottom 10?
When in any reports the default is to report ALL data.
Click on the drop down to see Top 10
The Default will be to View by Top 10 Sales.
To change this you will need to go to the Advanced Screen.
Now Choose another Dimension to View top 10 by e.g. Top 10 by Profit.