Is WP External Links heavy load?

It says that this plugin puts a heavy load on the server.

https://help.mixhost.jp/hc/ja/articles/115003734871-WordPress%E3%82%92%E3%82%88%E3%82%8A%E9%AB%98%E9%80%9F%E5%8C%96-%E6%9C%80%E9%81%A9%E5%8C%96-%E8%B2%A0%E8%8D%B7%E8%BB%BD%E6%B8%9B%E3%81%99%E3%82%8B%E6%96%B9%E6%B3%95

WP External Links
It is a plugin that can automatically set the behavior of external links in the site, but it seems to generate a high load when access increases. Please consider stopping the plug-in by editing the link directly.

Is the load of rewriting the link high?
Or is it burdensome just to look for a link tag?