Squid HTTPS Tunnelling using CONNECT very slow
I know it is a old question but i had the same problem and solved using this in squid.conf
Posting this as I think it will be helpful to anyone running squid with a pfSense box. Thanks to Juliano for their answer! The same setting can be found under (in your pfSense box) Services > Squid Proxy Server > General as
Resolve DNS IPv4 First. Below is a screenshot.