Is checking whether the blog is installed necessary?

You Could, but I would never ever mess with core files.

Apart from that I do not believe that the is_blog_installed() function causes your site to be unresponsive.
Try disabling all plugins first, and set the theme to one of the default themes.
Updating your site, plugins and themes could help you as well. Try to narrow your problem down. I suspect it’s either in a theme or plugin.

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