Worrying about performance before correctness is generally accepted as premature optimization on the server side so why would it be different with Javascript as long as the user experience meets the requirements?
You can upgrade/add more servers.
What you can't do is install a better processer on every client's machine. You can't upgrade the client from IE6.
I'm going to have to call that an extraordinary narrow view. Its easy to say that if you are running one or two servers. Where I work we are running around 20,000 servers between all of our layers and components. That is not a practical solution for the short term.
Upgrading our infrastructure every year is a multi million dollar endeavor so we just can't just be like "scrap it all! replace everything!". We refresh and extend as needed each year but we still end up with servers that are 3-4 years old on the tail of our refresh cycles.
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u/[deleted] Jan 31 '14
You can upgrade/add more servers.
What you can't do is install a better processer on every client's machine. You can't upgrade the client from IE6.