The reason I didn’t mention it more is because performance is largely irrelevant. First of all, for the vast majority of web applications, performance is a non-issue. That’s why Perl, PHP, Python, and Ruby have been so immensely successful. (And why Smalltalk has been excellent for web development since the early 2000s.)
Second, when it comes to performance, it’s hard to beat hand-coded assembly language. Nevertheless, very few people today would advocate for using assembly language over C, Java, C#, and Go. Performance isn’t everything and people generally prefer languages that make their job easier.
You’re looking for examples? They’re coming!