bug#33350: 26.1; Emacs performance strike when using source-code-pro and unicodes together

[Eli Zaretskii]

> From: michi bliblablub <michi98game@gmail.com>
> Date: Mon, 12 Nov 2018 00:28:08 +0100
> 
> emacs is extremly slow on my windows 10 when using the Source-Code-Pro-Font
> (https://github.com/adobe-fonts/source-code-pro) toeghter with any
> unicode-characters (tested with two examples θ and μ).
> I set the font by following lisp code in my init.el file:
>  "(set-frame-font "-outline-Source Code 
> Pro-normal-normal-normal-mono-*-*-*-*-c-*-windows-1258")"
> 
> Question:
> On which side lies the error? On Emacs, on the Font, on Windows (as usual), 
> or something between my
> chair and my keyboard(also, as usual)?

Does it help to set inhibit-compacting-font-caches to a non-nil value?