Courses term input very slow with many terms

[jonespm]

Summary:

In the Accounts->Courses page when you have a lot of courses in your institution it takes a long time to populate the drop-down, almost a minute in some cases. This looks like because it's doing a per_page=10 and it takes 2-3 seconds per request. This blocks selecting any term until this is completed. This feels like it worked faster in the past.

Having a larger per_page should be an easy fix. A value of 100 query takes the same amount of time as 10.

Steps to reproduce:

1. Go to Accounts->Courses page in an installation with over 50 terms, ideally 100.
2. Notice the speed of the dropdown terms filter

Expected behavior:

Terms should populate much faster and be usable

Actual behavior:

Terms dropdown can take over 60 seconds in some cases to actually be usable

Additional notes: