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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: How should this profiler report interpreted?
Date: Fri, 26 Mar 2021 17:35:49 +0300
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 (message from scame on Fri, 26 Mar 2021 13:59:36 +0000)
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> Date: Fri, 26 Mar 2021 13:59:36 +0000
> From: scame <laszlomail@protonmail.com>
> 
> I have a function which I use to process some files and it works
> slowly with bigger files. I tried to profile it and I got this output.
> Only the relevant part is shown:
> 
>  - save-excursion                                     9817  99%
>   - insert                                               2   0%
>    - jit-lock-after-change                               1   0%
>     - run-hook-with-args                                 1   0%
>        font-lock-extend-jit-lock-region-after-change     1   0%
> 
> Does this mean the save-excursion call itself consumes 99% of the CPU?

Yes (assuming that nothing else went on in that Emacs session when you
profiled the function you were interested in).