The problem with large websites is that there's a dozen layers of abstractions leading to large and inefficient code. But when it comes to just raw speed (itera

The problem with large websites is that there's a dozen layers of abstractions leading to large and inefficient code. But when it comes to just raw speed (iterating over a huge array of numbers in a tight loop, like drawing this chart), then it's blazing fast especially with JIT. That's specifically where a lot of people underestimate JS. I've seen a lot of people do things in the backend when they can just send all the data and do all the filtering/sorting locally leading to much faster UX.