Erik Abrahamsson is working on two performance improvement patches for Blender, more specifically, patches that will optimize the speed of Creation and Deletion of Objects.
The patch for the performance increase upon deletion of Objects, which has already been approved, marks a speed improvement of around 20%! Erik provides an example benchmark of deleting 10000 objects, increasing the speed of deletion from 35.6 to 18.8 seconds.
The patch aiming to improve the speed of creation of objects is still being worked on, but is already showing important performance improvements, with a speed increase of 55% in some cases! The specific benchmark given by Erik shows the speed of creation of 10000 randomly named objects going from 9 to 5.8 seconds.