Uh well, it wasn&#x27;t &quot;decades ago&quot; but it was some old timey stuff. Yahoo used Apache 1.3 as recently as 2012. They also disabled Keep-Alive on Apache, and most properties would use the hardcoded default number of prefork processes (32). It wasn&#x27;t the smartest setup.<p>Nevertheless, I don&#x27;t think that nginx &#x2F; Apache &#x2F; Varnish &#x2F; haproxy &#x2F; etc. are able to handle similar concurrent connection levels as ATS without significantly impacting 95th percentile latency due to their core architectures.