Computation times

00:22.043 total execution time for 3 files from examples/topology_optimization:

Example	Time	Mem (MB)
Solve a 2D MBB topology optimization problem (plot_topology_optimization_MBB.py)	00:08.866	0.0
Solve a 2D short cantilever topology optimization problem (plot_topology_optimization_short_cantilever.py)	00:08.620	0.0
Solve a 2D L-shape topology optimization problem (plot_topology_optimization_L_shape.py)	00:04.557	0.0