Testing instructions are the same as  MDL-70038 but running the task is slightly different because the task was changed from scheduled task to ad-hoc from 3.11 by MDL-71468 Prerequisites This test requires Ghostscript and Poppler to be installed on the server. A PDF file is wanted, the larger it is the greater the difference in time that will be appreciated. (Feel free to use any of the attached PDFs on this issue) Setup Go to Site administration > Server > System paths page(admin/settings.php?section=systempaths). Verify that the Path to ghostscript setting points to your local gs path (be sure is correctly set). Verify that the Path to pdftoppm setting is empty. Verify the queue of conversions is empty (table task_adhoc does not have a record for \assignfeedback_editpdf\task\convert_submission ) or run cron first to make sure existing ad-hoc tasks are removed from the task_adhoc table. Create a course. Add an assignment with following options: Submission types: File submissions Feedback types: Annotate PDF. Do the following tests before and after the patch Test - Ghostscript As a student, submit a PDF to the assignment. Verify the database table task_adhoc has 1 record for \assignfeedback_editpdf\task\convert_submission . Run the scheduled task: time php admin/cli/adhoc_task.php --execute This execution will use gs to generate PNG files from your PDF file. Record the total execution time. (After the patch only) As admin or teacher, go to grade the submission. Confirm you see the submission content. (The converted PDF is shown on the assignment grading interface) Test - Poppler Set up the path for the pdftoppm tool: Go to Site administration > Server > System paths page(admin/settings.php?section=systempaths). Add your local pdftoppm path to the Path to pdftoppm setting (be sure it is correctly set). Log in as another student Submit the same file Run the scheduled task: time php admin/cli/adhoc_task.php --execute This execution will use gs to generate PNG files from your PDF file. Record the total execution time. (After the patch only) As admin or teacher, go to grade the submission. Confirm you see the submission content. (The converted PDF is shown on the assignment grading interface) Confirmation Confirm that the processing times in both Ghostscript and Poppler after the patch are lower than the times before the patch.