How do I prevent students from seeing grades and comments on Speed Grader until I've graded all the papers?
There is an option called "Mute" which prevents anything done for a specific grade book column/assignment from going out until you Unmute the item:
How do I mute or unmute an assignment in SpeedGrader?
How do I mute or unmute an assignment in the Gradebook?
How do I hide grades that were previously posted in the New Gradebook?
Professor of Classics, the University of Iowa
Newberry Library Scholar-in-Residence
Department of Classics
210 Jefferson Building
Iowa City, Iowa, 52242
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