Nginx redirect assets to CDN from Wordpress

default.conf

server {
    ## Your website name goes here.
    server_name domainname.com www.domainname.com _;
    ## Your only path reference.
    root /var/www/;
    listen 8080;
    ## This should be in your http block and if it is, it's not needed here.
    index index.html index.htm index.php;

    include conf.d/drop;

        location / {
                # This is cool because no php is touched for static content
			try_files $uri $uri/ /index.php?q=$uri&$args;
        }

        location ~ \.php$ {
            fastcgi_buffers 8 256k;
            fastcgi_buffer_size 128k;
            fastcgi_intercept_errors on;
            include fastcgi_params;
            fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
            fastcgi_pass unix:/dev/shm/php-fpm-www.sock;


        }
          
	  location ~ ^(/wp-content/themes|/wp-content/uploads)/.*\.(jpe?g|gif|css|png|js|ico|pdf|m4a|mov|mp3)$ {
		     rewrite ^ http://cdn.domain.com$request_uri?
		     permanent;
		     access_log off;
	  }



}

I had tested one of my sites with the above code at Pingdom Website Speed Test. I got a lower score and warnings that I should minimize the amount of redirects. The above code obviously generates a lot of redirects. i wonder, what is the alternative and would rewriting all the paths at my site's HTML/database to the CDN address be a better solution. Is there any speed disadvantage of using Nginx rewrite for this? Thanks.

Another way is the "try_files" with proxy, I hope this help anyone looking for a way to use files from production while working at a local environment and big thanks for the author for providing the regex:

# If file not found at local environment, use production server
    location ~ ^(/wp-content/themes|/wp-content/uploads)/.*\.(jpe?g|gif|css|png|js|ico|pdf|m4a|mov|mp3)$ {
        expires 24h;
        log_not_found off;
        try_files $uri $uri/ @production;
    }
    # The Production Server Proxy
    location @production {
        resolver 8.8.8.8;
        proxy_pass https://production.com/$uri;
    }

hi!
I implemented both these methods with the setting described here: https://github.com/A5hleyRich/wordpress-nginx
Here is the list of extentions I used: (jpe?g|gif|css|png|js|ico|pdf|m4a|mov|mp3|docx?|xlsx?|pptx?)
It works for documents but not for image files. Any idea why I have a GET in the logs for documents (good) and an open() instead of the images?
thanks