I am still planning to use memcache and varnish together.

Let's see if someone have already tested varnish 4 on IPS 4 to fine tune the VCL.

I recently migrated my site from one provider to another who has Varnish installed on all their servers. 

I immediate saw a ton of issues pop up, users could not login, users could not log out, users could not submit posts, mods could not delete posts, etc. All related to CSRF keys. 

So Varnish has been the bane of my existence lately. 

  On 6/27/2015 at 6:42 PM, kotaco said:

I recently migrated my site from one provider to another who has Varnish installed on all their servers. 

I immediate saw a ton of issues pop up, users could not login, users could not log out, users could not submit posts, mods could not delete posts, etc. All related to CSRF keys. 

So Varnish has been the bane of my existence lately. 

That's why we need some expert on Varnish to configure the VCL for the IPS 4.