Profiling with Valgrind memcheck and gprof to check for memory leaks and performance problems. Could things be sped up by not using so much C++ standard library things (which I used copiously for educational purposes, instead of clobbering everything together in C)? One mustn't assume so, sez Stroustrup - testing is needed.
Loading could be drastically improved by saving JSON and COLLADA model formats in a form suitable for my game environment. The vertex indexer currently involves a triple-nested for-loop!
All the valgrind warnings are gone apart from one about the OpenGL library. That can't be my fault, right?