So suddenly without any deployments in 2 weeks, one route started to be super slow (6-30seconds instead of usual 0.4sec)

I've checked database, redis (cache & sessions on it), restarted them - nothing.

Thought to create a debug route and contoller's method, to check which part causes issues. Started with simple:

Route::get('/random-debug-url/{category}/{slug}', 'ContentController@index')->name('content.index');
Route::get('/{category}/{slug}', 'ContentController@index')->name('content.index.old');

Gone to check the new url (random-debug-url/category/slug) - yeah, still loading slowly. Checked old url (category/slug) - boom, works as fast as always (~400ms). The only difference, that the old route have changed route-name. The new url, has old route name, and it still performs poorly.

Specs: Laravel 8.12, PHP 7.4, Opcache

Newrelic report: https://prnt.sc/26d8mni

It says that in worst case (61s) this took 99.999% of time:

Illuminate\Filesystem\Filesystem::Illuminate\Filesystem\{closure}   7   60,700 ms   100%

Any ideas? How come the same controller/method perform differently just by having different route name?