Symfony: symfony/framework-bundle v5.4.14| v6.1.7
symfony/error-handler v5.4.15| v6.1.7

Same is with latest 5 and 6 versions. There is no docs of how to disable these useless messages which make impossible to use this framework.

The whole output is messed with hundreds of "[info] User Deprecated:" errors. Impossible to use bin/console - hunderds of deprecation messages. Each request takes multiple seconds because of very slow error handling.

I tried according to stackoverflow (no docs regarding this. You can try "disable deprecated warning site:symfony.com" - no results):
framework.yaml
php_errors:
log: false

I tried:
error_reporting(0) - does not work

Actually nothing works. Lots of issues - no solution.

symfony/symfony#35575 (comment)

The only working way to handle is to override boot method of App\Kernel:

    public function boot()
    {
        parent::boot();
        ErrorHandler::register(null, false)->setLoggers([
            \E_DEPRECATED => [null],
            \E_USER_DEPRECATED => [null],
        ]);
    }