Dashboad login slow due to CONCATENATE_SCRIPTS

I have noticed a site always has a style not loading completely problem when logged in for a long time. It would be alright after refreshing.

It’s easy to guess that something triggered the limit, but after the refresh it had cached some resources, so it was normal.

I take a quick look at the network panel, there are a lot of scripts loading separately, but I haven’t set define(‘CONCATENATE_SCRIPTS’, false); in wp-config.php .

After some disabling plugins and troubleshooting I found：

/**
 * Due to bugs in the 5.5 core release concatenate scripts is causing errors.
 *
 * Because of this we disable it.
 *
 * @return void
 */
public function disable_concatenate_scripts() {
    global $concatenate_scripts;

    $concatenate_scripts = false;
}

in wordpress-seo/src/integrations/admin/diable-concatenate-scripts-integration.php .

Please take a look at whether this temporary fix still needs to be retained.