Nginx, PHP-FPM + X-accel-redirect: Configuration for a high performance Download server

Hello I am running a dedicated server with Vestacp installed with Nginx, PHP-FPM + X-accel-redirect. Php no longer handle downloading process. This server is a storage server, visitor access to (Nginx) --- File Hosting script will generate token (PHP-FPM) --- Files are downloaded (X-accel-redirect). Therefore, I just want to make configuration to optimize and make the server works with high performance with just above functions. You will be able to remote my computer with teamviewer to access root through my PC for any investigations. After All, I need you give instruction with explanation in details, I will config my self, and see the result. Good result, you get money. If you are not so expert in nginx web-server, don't try. File hosting is complicated and need deep knowledge. Here is the instruction to install the script on a main server: [login to view URL], you guys may want to take a look on Setup File Servers (optional) section for installing my remote server, where all files are stored. Thanks