Sorry, you are wrong..
The cage is there to only lightly retain the balls (the balls run in the so called "deep groove" of the bearing), and they dont come into contact because the lubricant (grease or oil film) acts as a buffer - the gap between the cage and balls is measured in microns.
The weight of the cage is measured in milligrams - the speeding up or slowing down would be insignificant unless your grease was so thick it caused drag.
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2001 Boxster S (triple black). Sleeping easier with LN Engineering/Flat 6 IMS upgrade, low temp thermostat & underspeed pulley.
2001 MV Agusta F4.
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