Refactor for performance

[hgrecco]

• Closes # (insert issue number)
• Executed pre-commit run --all-files with no errors
• The change is fully covered by automated unit tests
• Documented in docs/ as appropriate
• Added an entry to the CHANGES file

[codspeed-hq]

CodSpeed Performance Report

Merging #1817 will degrade performances by 23.33%

_{Comparing develop (295e39c) with master (2d649ea)}

Summary

🔥 28 improvements
❌ 4 (👁 1) regressions
✅ 389 untouched benchmarks

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Benchmarks breakdown

	Benchmark	master	develop	Change
🔥	test_build_cache	7.4 ms	3.3 ms	×2.3
🔥	test_getattr[True-ms]	1,109 µs	152.2 µs	×7.3
🔥	test_getattr[False-kilometer]	1,146.2 µs	881.6 µs	+30.02%
🔥	test_getattr[False-millisecond]	1,143.7 µs	887.9 µs	+28.81%
🔥	test_getitem[True-ms]	2.5 ms	1.9 ms	+32.25%
🔥	test_parse_unit_name[True-meter]	360.9 µs	59.1 µs	×6.1
🔥	test_parse_unit_name[True-kilometer]	384.7 µs	57.1 µs	×6.7
🔥	test_parse_unit_name[True-second]	341.3 µs	57.7 µs	×5.9
🔥	test_parse_unit_name[True-minute]	360.2 µs	57.7 µs	×6.2
🔥	test_parse_unit_name[True-angstrom]	360.3 µs	57.9 µs	×6.2
🔥	test_parse_unit_name[True-millisecond]	384 µs	56.9 µs	×6.7
🔥	test_parse_unit_name[True-ms]	381.7 µs	57.2 µs	×6.7
🔥	test_parse_unit_name[False-meter]	365.8 µs	57.8 µs	×6.3
🔥	test_parse_unit_name[False-second]	347.3 µs	57.6 µs	×6
🔥	test_parse_unit_name[False-minute]	366.1 µs	57.7 µs	×6.3
🔥	test_parse_unit_name[False-angstrom]	366 µs	57.8 µs	×6.3
🔥	test_parse_units[True-ms]	1,055.4 µs	91.7 µs	×12
🔥	test_parse_units[False-kilometer]	1,090.4 µs	842.4 µs	+29.45%
🔥	test_parse_units[False-millisecond]	1,076.9 µs	847.2 µs	+27.11%
🔥	test_parse_expression[True-ms]	2.6 ms	2 ms	+31.83%
...	...	...	...	...

ℹ️ Only the first 20 benchmarks are displayed. Go to the app to view all benchmarks.