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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Make emacs-eww render asynchronously
Date: Tue, 19 Mar 2019 21:35:17 +0200
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> From: Vladimir Sedach <vas@oneofus.la>
> Date: Tue, 19 Mar 2019 11:10:32 -0700
> Cc: help-gnu-emacs@gnu.org
> 
> I find that profiler.el is not very useful for discovering things
> that cause lag and latency.

I can only understand that claim if in your case the slowdown/lagging
is due to redisplay, which is written almost entirely in C, and
profiler.el sees it as just one function.  Otherwise, profiler.el is
generally a very useful tool for spotting hot spots and bottlenecks,
IME.