speed-up-404-static-files.php

<?php
/**
 * Plugin Name: Speed Up 404 Static File
 * Description: Skip WordPress handling 404 on static files to avoid lack of performance.
 * Author: GeekPress
 * Licence: GPLv2 or later
 * */

$path      = parse_url( $_SERVER['REQUEST_URI'], PHP_URL_PATH );
$path      = trim( $path, '/' );
$extension = pathinfo( $path, PATHINFO_EXTENSION );
$basename  = pathinfo( $path, PATHINFO_BASENAME );

$allowed_extensions  = [
	'js'               => 1,
	'css'              => 1,
	'ico'              => 1,
	'png'              => 1,
	'jpg'              => 1,
	'jpeg'             => 1,
	'gif'              => 1,
	'webp'             => 1,
	'svg'              => 1,
	'ogg'              => 1,
	'mp4'              => 1,
	'webm'             => 1,
	'ttf'              => 1,
	'otf'              => 1,
	'ttf'              => 1,
	'woff'             => 1,
	'woff2'            => 1,
];

// Don't try to optimize these files.
$excluded_files = [
	'superpwa-sw.js' => 1,
];

if ( strlen( $extension ) > 0 && isset( $allowed_extensions[$extension] ) && ! $excluded_files[$basename] && ! file_exists( ABSPATH . $path ) ) {
	status_header( 404 );
	die();
}