I personally don't find much use for a CDN when dealing with a typical website's CSS, JS, images until you have very large traffic. You can concat and minify your CSS and JS files, and add a cache control header to all static content. That should be good enough until you get very large traffic.
But like anything, it depends on the use case. If the product is primarily a file server like Dropbox then maybe using a CDN early makes sense. Or your smallish number of users are spread across the world might be another use case.
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I personally don't find much use for a CDN when dealing with a typical website's CSS, JS, images until you have very large traffic. You can concat and minify your CSS and JS files, and add a cache control header to all static content. That should be good enough until you get very large traffic.
But like anything, it depends on the use case. If the product is primarily a file server like Dropbox then maybe using a CDN early makes sense. Or your smallish number of users are spread across the world might be another use case.