I'm a varnish user and I have no complaints. It is well documented, easy to use and solves complex problems with VLC/VMODs. I'm not pushing nowhere near 100GB/s

I'm a varnish user and I have no complaints. It is well documented, easy to use and solves complex problems with VLC/VMODs. I'm not pushing nowhere near 100GB/s, but I have benchmarked up to 10GB/s which isn't a problem with default settings and just 1-2 CPU cores, this was with 8kb payloads. I'm sure you have some edge cases which requires heavy OS tuning, but I would not say it is fair to warn users against Varnish. With 100GB/s and very small HTTP requests you are clearly in a different group than 99.9999% of the rest and most likely also have the resources to write your own special case http cache or you could hire phk@ as a consultant.