Hi Benjamin,
Very useful, thanks for sharing! You should consider submitting these to the Wolfram Function Repository.
Thanks for the suggestion, I think because of having multiple functions + LibraryLink files, it's a perfect candidate to use the upcoming paclet repository to activate the "Time-Related Computation" section.
Thanks for sharing! I wonder why Wolfram did not improve it themselves. I once logged a case about slowness and I don't think I'm the only one. Great work!