When a course contains 2000 users and more than 200 activity modules, the chrome-based browsers having difficulties with rendering grading report content and throwing an error code: SIGILL. I could reproduce it on the Chrome and Vivaldi, although it works fine with Firefox.

Browser tested:

Firefox - passed

Chrome - failed

Vivaldi - failed

Test instructions:
1. Create a test course with 2000 users and 200 activity modules.

    1.1 modify $paramassignments and $paramusers inside the admin/tool/generator/classes/course_backend.php, set $paramassignments from 100 to 200 and $paramusers from 1000 to 2000

    1.2 Run cli command: php admin/tool/generator/cli/maketestcourse.php --size=M --shortname=SIZE_M 

2. Open created course Grader Report.
3. Set per page setting to all (at the bottom left of the screen)
4. Wait until it loads (it can throw "Allowed memory size" error, in this case raise memory_limit and also raise max_execution_time inside the php.ini config file)

Actual result:

Grading report content isn't loading and throwing an error code: SIGILL.

Expected result:

Grading report content should load