I think I've written the world's fastest Blender exporter. It exports full levels in 9 milliseconds. Check out this video where I show live editing of levels from blender, and it updates instantly in the game. For some context: Okay, since the beginning of development on this game project, I knew I didn't want to write a custom level editor for it and rather spend my time programming the game. I decided to use blender as the level editor, and export directly from blender to my game engine's file format. Blender only lets you write add-ons in Python, which is not just incredibly slow but also a terrible platform for this kind of systems programming work. So, after having a Python exporter for the longest time, I decided enough was enough, and I programmed this exporter in C. Blender doesn't expose any C API or interface. So my only option was to download Blender's source code and insert my code directly into Blender. And that's what I did :) So this new C exporter not only is orders of magnitude faster than the python version, but also is way more robust. And because I'm in C land, my hands are much freer to do things. There are two elements of secret sauce that make this exporter run so fast: - A custom memory arena implementation. - Lockless multithreading.