[MDL-39450] Terrible performance in the course format code - Moodle Tracker

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Testing Instructions:
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1. Run the unit tests.

2. Do some basic CRUD operations on some courses in a range of formats, to ensure there are not obvious regressions.

Test 3 (performance):

Create course in topics format (having the default format weeks)

View the course, make sure that performance info on course/view.php is better than before change
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1. Run the unit tests. 2. Do some basic CRUD operations on some courses in a range of formats, to ensure there are not obvious regressions. Test 3 (performance): Create course in topics format (having the default format weeks) View the course, make sure that performance info on course/view.php is better than before change
Affected Branches:
MOODLE_24_STABLE
Fixed Branches:
MOODLE_24_STABLE
Pull from Repository:
git://github.com/timhunt/moodle.git
Pull Master Branch:
~~MDL-39450~~
Pull Master Diff URL:
https://github.com/timhunt/moodle/compare/master...MDL-39450

There are hundreds of calls to format_base::instance on a typical course, and that function is very expensive (despite its internal caching).

has a non-specific relationship to

MDL-35727 use MUC for caching of format_base instances