HAProxy slow speed

[mhaluska]

I'm experiencing really slow speed with HAProxy plugin.

Server is on 1Gb line, my home download speed is 300Mb. With Port forwarding I'm hitting my download speed, with HAProxy is maximum around 150Mb (same speed for HTTP or HTTPS offloading). With HTTP/2 enabled on HAProxy it's much lower, around 50Mb.
OPNsense and machine behind HAProxy are KVM on Proxmox. All HW offloading are disabled.

Proxmox: 2* E5-2450L v1 ( 1.80GHz base clock)
OPNsense config: 2 socket * 4 cores with numa=1, 2GB RAM
HAProxy:

• nbproc=1
• nbthread=4
• cpu-map auto:1/1-4 0-3 (tried also different cpu-map, no luck)
• 12 ACLs

Thanks a lot for any hint.