UI Observer section causes entire game menu to dive 1-4 fps and become sluggish

To reproduce:

  1. Navigate to the Multiplayer > Observer section.
  2. Navigate through the ongoing game list using the down arrow key starting from the top.
  3. Highlight over 20-30 games as you go down the list using the down arrow key.
  4. The game menu system will dive to 1-4 frames per second and stay this way until relaunching.