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We have a web site that does not have a favourite icon favicon.
Therefore, we get a lot of http 404 errors for the file favicon.ico.
For the functionality of the web site it does not make a difference.
But I was wondering if the system uses more time looking for a file that is not there, rather than returning a 304 not modified?
At max load we have ca. 15,000 concurrent connections across all frontend servers.
No, the performance difference is insignificant – if you don’t want to have a favicon, I’d suggest creating a 0-byte /favicon.ico : the logs will stop complaining, and the browsers will behave as if there’s no favicon.
Also, you could set a far future Expires header for your favicon – that way, the clients will only request it once, further reducing the load.