The time tracking app used at my company was created with Angular JS. Most functionality is quite fast so I can understand why they wanted to go this route. Unfortunately, the clock in section takes forever to load during peak traffic times... which is the only time that functionality is used. Someone found an older section of the site written with server side tech. Now everyone just bypasses the Angular clock in and uses the old one.

You shouldn't use tech for the sake of using it, it should also perform better than what it's replacing.