Computation times

00:01.213 total execution time for 4 files from examples/optimization_problem:

Example	Time	Mem (MB)
How to solve an optimization problem (plot_simple_optimization_example.py)	00:00.610	0.0
Analytical test case # 3 (plot_simple_opt_3.py)	00:00.308	0.0
Analytical test case # 2 (plot_simple_opt_2.py)	00:00.293	0.0
Analytical test case # 1 (plot_simple_opt_1.py)	00:00.002	0.0