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Bug
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Resolution: Duplicate
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Critical
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None
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4.1.4, 4.2, 4.2.1
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None
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MOODLE_401_STABLE, MOODLE_402_STABLE
When testing the patch from MDL-76174, we found that it would cause my/courses.php to go from slow (the original problem) to unusable. The page would load forever (effectively).
The full story is in the comments for MDL-76174 but it turns out that the SQL query performs badly when there are large numbers of role assignment at course category level. Our site has over 4,000.