Slow squid work after update to 2.7.0

[ao_kalachev]

Hello.
I have pfSense 2.6.0 HA cluster with squid with kerberos auth.
I start testinge 2.7.0 on backup node.
Remove squid package, update, install squid again, made node active.
Squid starts work slowly at 5-10 times. Some web-pages don't olpen at all.
In syslog i founds many errors like "Listen queue overflow" on squid port.
I add var kern.ipc.somaxconn with value 4096, but its don't help.
Also i try add var kern.ipc.nmbclusters from manuals, result the same.
I try search info in squid debug logs, but don't find nothing useful.
Also i try disable all ACLs list, same result.
How i can speed up squid on 2.7.0?
Config

# This file is automatically generated by pfSense
# Do not edit manually !

http_port 172.20.16.69:8080
http_port 127.0.0.1:8080
http_port [::1]:8080
tcp_outgoing_address 172.20.16.67
icp_port 0
digest_generation off
dns_v4_first on
pid_filename /var/run/squid/squid.pid
cache_effective_user squid
cache_effective_group proxy
error_default_language ru
icon_directory /usr/local/etc/squid/icons
visible_hostname proxy.domain.local
cache_mgr admins@domain.net
access_log /var/squid/logs/access.log
cache_log /var/squid/logs/cache.log
cache_store_log none
netdb_filename /var/squid/logs/netdb.state
pinger_enable on
pinger_program /usr/local/libexec/squid/pinger

logfile_rotate 7
debug_options rotate=7
shutdown_lifetime 3 seconds
# Allow local network(s) on interface(s)
acl localnet src  172.20.16.0/21 127.0.0.0/8 ::1/128
forwarded_for on
uri_whitespace strip
dns_nameservers 172.20.0.2 172.20.16.7 172.20.0.21
acl dynamic urlpath_regex cgi-bin \?
cache deny dynamic

cache_mem 64 MB
maximum_object_size_in_memory 256 KB
memory_replacement_policy heap GDSF
cache_replacement_policy lru
minimum_object_size 0 KB
maximum_object_size 4 MB
cache_dir ufs /var/squid/cache 100 16 256
offline_mode off
cache_swap_low 90
cache_swap_high 95
cache deny all
# Add any of your own refresh_pattern entries above these.
refresh_pattern ^ftp:    1440  20%  10080
refresh_pattern ^gopher:  1440  0%  1440
refresh_pattern -i (/cgi-bin/|\?) 0  0%  0
refresh_pattern .    0  20%  4320


#Remote proxies


# Setup some default acls
# ACLs all, manager, localhost, and to_localhost are predefined.
acl allsrc src all
acl safeports port 21 70 80 210 280 443 488 563 591 631 777 901  8080 3129 1025-65535
acl sslports port 443 563  63103 1500 22700 8531 8443 9443

acl purge method PURGE
acl connect method CONNECT

# Define protocols used for redirects
acl HTTP proto HTTP
acl HTTPS proto HTTPS
http_access allow manager localhost

http_access deny manager
http_access allow purge localhost
http_access deny purge
http_access deny !safeports
http_access deny CONNECT !sslports

# Always allow localhost connections
http_access allow localhost

quick_abort_min 0 KB
quick_abort_max 0 KB
request_body_max_size 0 KB
delay_pools 1
delay_class 1 2
delay_parameters 1 512000/512000 512000/512000
delay_initial_bucket_level 100
delay_access 1 allow allsrc

# Reverse Proxy settings


# Custom options before auth
auth_param negotiate program /usr/local/libexec/squid/negotiate_kerberos_auth -k /usr/local/etc/squid/proxy.keytab -t none
auth_param negotiate children 50
auth_param negotiate keep_alive on
acl auth proxy_auth REQUIRED
acl allowtodomain dstdomain "/usr/local/etc/squid/access_to_domain.txt"
#acl allowfromip src "/usr/local/etc/squid/access_from_ip.txt"
acl denytodomain dstdomain "/usr/local/etc/squid/denied_to_domain.txt"
acl denytoip dst "/usr/local/etc/squid/denied_to_ip.txt"
acl denyfromip src "/usr/local/etc/squid/denied_from_ip.txt"
http_access deny denytodomain
http_access deny denytoip
http_access deny denyfromip
http_access allow allowtodomain
#http_access allow allowfromip
http_access deny !auth
http_access allow auth

# Set YouTube safesearch restriction
acl youtubedst dstdomain -n www.youtube.com m.youtube.com youtubei.googleapis.com youtube.googleapis.com www.youtube-nocookie.com
request_header_access YouTube-Restrict deny all
request_header_add YouTube-Restrict none youtubedst
# Setup allowed ACLs
# Allow local network(s) on interface(s)
http_access allow localnet
# Default block all to be sure
http_access deny allsrc