MVC 5 CRUD and Logging with high load

I am currently building a replacement to my company's legacy cms. This will be used to maintain 200 or so older static html websites. My question is concerning design approach given the potential for more than 100 users attempting to do read/write operations to different sites at the same time. Is there an industry standard way of doing this that will mitigate potential load issues. I'm not sure whether the class that handles the CRUD should be a Singleton or Static. Any advice would be greatly appreciated.