On my system ( fairly complex, ~30 projects, several hundred versions etc.) The issue list page is slow to load. Almost no time is reported in the DB, most of the time is spent in the view, most of which is spent rendering the filters.
This patch reduces some of that load by avoiding ( I think ) an un-neccessary sort of the filter options, I suspect the loop traversal could occur just once instead of twice.
Patch attached. For me this shaves ~33% of the render time off!