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When it comes to performance, you shouldn’t be stingy. There are millions of sites, and you are in close competition with every one of those Google search query results. Research shows that users will abandon sites that take longer than three seconds to load. Three seconds is a very short amount of time. While many sites nowadays load in less than one second, there is no one size fits all solution, and the first request can either be the do or die of your application.
Modern frontend applications are getting bigger and bigger. It is no wonder that the industry is getting more concerned with optimizations. Frameworks create unreasonable build sizes for applications that can either make or break your application. Every unnecessary bit of JavaScript code you bundle and serve will be more code the client has to load and process. The rule of thumb is the less, the better.
Data loading patterns are an essential part of your application as they will determine which parts of your application are directly usable by visitors. Don’t be the site that slows their entire site because they chose to load a 5MB image on the application’s homepage and understand the issue better. You need to know about the resource loading waterfall.