Re: Is it possible to profile elisp?

[Eli Zaretskii]

> From: Perry Smith <pedz@easesoftware.com>
> Date: Sun, 20 Nov 2022 08:17:04 -0600
> 
> I do a grep and get some results into the *grep* buffer.  The hits happen to 
> be in Org mode files if that matters.
> 
> I do C-X ` and it takes 5 seconds to bring up the buffer.  A next C-X ` are 
> in the same file and are instant.  But the one that has to open a different 
> file again takes 4 to 5 seconds.
> 
> This by itself doesn’t bother me that much.  But I’m actually chasing weird 
> problems and I’m wondering if this is connected to it or not.
> 
> The weird problems are with lsp-mode using a package called lsp-tailwindcss.  
> It is suppose to pop up completion suggestions.  Every once in a VERY great 
> while, it does.  But usually it does not.  I can pause and not enter any keys 
> for a minute and no suggestions pop up.  I have
> 
> company-minimum-prefix-length set to 1 and company-idle-delay set to 0.0.  If 
> I set the idle time to 0.5 and prefix length to 2, the completions pop up but 
> I have to sit for about 2 seconds before anything pops up.
> 
> So… I’m theorizing that I’ve got something wasting time or is horribly 
> inefficient but I have no idea how to track it down.
> 
> I’m on one of Apple’s best / latest laptops so I believe I have plenty of 
> horsepower and the CPU stats are close to 0.

I'm not sure I understand what you are after, but Emacs has a built-in
profiler, see profiler-start.