by Andrew Nicols.
Hi,
/course/manage.php (introduced in Moodle 2.5) has hit some performance issues which I've been working to debug.
One of them is fixed in MDL-40130 - essentially, the cache was not being correctly used. This should be available in Moodle 2.5.1 or you can apply the three-line patch sooner if you wish.
I've also been working on MDL-40280 which should hopefully improve performance further. For us, this reduces the page load time from 123 seconds to 23 seconds so clearly further work is still required.
Andrew