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FastCGI is a computer software technology for integrating interactive programs into a web server. FastCGI is a variation on the earlier Common Gateway Interface (CGI); FastCGI's main aim is to lessen the burden on the web server imposed by each individual CGI program, allowing the server to scale up to handle many more concurrent requests. ASP Hosting.

When handling each request to a CGI program, a traditional webserver will create a new process to handle the request. The CGI program is run in that process, the result sent, and then the process is discarded. Creating processes is a resource-expensive task, and each concurrent process imposes a nontrivial burden on the server. For this reason CGI based webservers under heavy load often experience significant slowdowns, or become mostly unresponsive. SiteGround.