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A super simple solution that works for me is Signal's "Note to self" chat, I just write to myself and it works as a diary/ephemeral todo list. Easily accessible across multiple devices and can be backed up, including recently introduced cloud backups.

If I want some dedication information "pinned" so I don't lose track of it, I just create a dedicated group chat for that topic.

I think a good example here is Unity's Burst compiler - it uses a subset of C#, which allows for more assumptions and better optimization. Compared to regular Unity Mono environment, the code can be faster by one or two orders of magnitude and I've read in some cases it's even faster than C.