Last week we had a fourth sprint to improve CiviCRM performance at the socialist party.
During this sprint we started with looking at why the screen for adding and editing memberships loaded slow. The issue reported was that it took some time before the end date field jumped from the right side of the screen to the middle of the screen. It turned out that as long as the field was displayed at the right side the screen was still loading. Timing this gave a time of about 18 seconds before the screen was fully loaded.
We discovered a few causes: