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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: A question about overlays and performance.
Date: Sat, 25 Jul 2020 19:53:54 +0300
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To: Jeff Norden <jnorden@math.tntech.edu>
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> From: Jeff Norden <jnorden@math.tntech.edu>
> Date: Sat, 25 Jul 2020 11:40:26 -0500
> 
> Is there a way to predict how many overlays will be "too many" and
> start to slow thing down?

Thousands.

> Does the configuration of the overlays play a role?

What do you mean by "configuration" in this context?