The scalability and efficiency of any application can be increased by many factors, such as decreasing the DNS lookup time in which the DNS record is received from the DNS server. Also, it can be improved by avoiding URL redirects and duplicate code in the project. The application should also avoid unnecessary images, and browser caching should be encouraged. It also should avoid inline Javascript and CSS and defer Javascript parsing. Also, the application should use “srcset” for the responsive images. It would help if you placed all the application assets on a domain that is free of cookies using a Content Delivery Network preferably.