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This issue greatly improves the performance of displaying statistics in the question bank. 1. The required quiz statistics are now pre-computed by a scheduled task. 2. Cached statistics in the database are now never cleaned up, so the pre-computed stats are always available. 3. The way the cached statistics are loaded for each question that is being displayed is now a bit more efficient. 4. Related to that, there is a new callback which activities can implement, if they want their question statistics to be included in the ones shown in the question bank. Note, there is still further improvement possible to load the statistics for all questions being displayed in bulk. However, that must wait for a future issue, MDL-75576. The other improvements in this issue are significant and we did not want to delay releasing them. Co-authored-by: Jonathan Champ <jrchamp@ncsu.edu> Co-authored-by: Tim Hunt <t.j.hunt@open.ac.uk>
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