I graded 30 assignments in 8 minutes. What did I do wrong?

I was feeling completely overwhelmed this morning with a huge pile of grading looming before me. <br><br>This is what I did: <br><br>- I opened my Spotify tab on my laptop <br>- I opened my Google Classroom tab and clicked “view all.” <br>- Every single assignment I clicked, graded, and returned in approximately 15 seconds. <br><br>“Grade: 10/10, feedback: Good Job. Keep up the good work.” <br><br>I graded 30 assignments in about 8 minutes. <br><br>What did I do wrong?