docs: add an example on measuring import times

[art049]

[codspeed-hq[bot]]

CodSpeed Walltime Performance Report

Merging #73 will degrade performances by 12.46%

_{Comparing docs-import-time (651d394) with master (c92304c)}

Summary

⚡ 10 improvements
❌ 7 regressions
✅ 40 untouched benchmarks
🆕 3 new benchmarks

:warning: Please fix the performance issues or acknowledge them on CodSpeed.

Benchmarks breakdown

	Benchmark	BASE	HEAD	Change
⚡	test_iir_filter_process	2.8 µs	2.7 µs	+3.57%
❌	test_make_bandpass	4.8 µs	5 µs	-3.3%
⚡	test_combination_lists[4-2]	3.5 µs	3.4 µs	+5.2%
⚡	test_generate_all_combinations[4-2]	5.6 µs	5.5 µs	+2.69%
❌	test_generate_parenthesis[3]	7.4 µs	7.9 µs	-6.05%
⚡	test_generate_sum_of_subsets_soln[nums0-9]	21.4 µs	20.4 µs	+5.07%
⚡	test_is_safe[board0-1-1]	9.4 µs	9.1 µs	+3.67%
⚡	test_open_knight_tour[1]	3 µs	2.8 µs	+5.96%
⚡	test_solve_maze[maze0]	20 µs	18.5 µs	+7.9%
🆕	test_bench_module_import[.module_a]	N/A	1.9 ms	N/A
🆕	test_bench_module_import[.module_b]	N/A	3 ms	N/A
❌	test_count_even[count_even_slow]	1.3 ms	1.5 ms	-12.46%
❌	test_sum_of_squares[sum_of_squares_for_loop_power]	196.1 µs	206.4 µs	-5.01%
❌	test_sum_of_squares[sum_of_squares_sum_comprehension_power]	194.9 µs	208.2 µs	-6.41%
❌	test_sum_of_squares[sum_of_squares_sum_labmda_product]	217.4 µs	231.2 µs	-5.98%
🆕	test_bench_hash	N/A	55.1 µs	N/A
⚡	test_noop_ellipsis_decorated	304 ns	280.9 ns	+8.25%
⚡	test_noop_lambda	558.4 ns	547 ns	+2.08%
❌	test_noop_lambda_decorated	611.1 ns	645 ns	-5.25%
⚡	test_noop_pass_decorated	298.9 ns	291 ns	+2.69%

[codspeed-hq[bot]]

CodSpeed Instrumentation Performance Report

Merging #73 will not alter performance

_{Comparing docs-import-time (651d394) with master (c92304c)}

Summary

✅ 57 untouched benchmarks
🆕 3 new benchmarks

Benchmarks breakdown

	Benchmark	BASE	HEAD	Change
🆕	test_bench_module_import[.module_a]	N/A	3.1 ms	N/A
🆕	test_bench_module_import[.module_b]	N/A	5.5 ms	N/A
🆕	test_bench_hash	N/A	159.9 µs	N/A