Derp115 From r803 - r827 Changelog
" Why not swap to the old serverlist?
The old serverlist used alot of resources on older CPU models which reduced frame rates.
Since we have remade the entire BO2 Client, the old menu system will not work as it refuses to load and rather than spend another 4 months delaying the update because of this, we decided to use ImGUI which should allow us to keep the CPU usage lower and still provide a serverlist. "