Hello, After changing some kernel parameters, starting session result to be very slow, about two minutes.
Boot and all other thing are faster, with no problems at all.
Things i've modified:
/etc/sysctl.conf
kernel.dmesg_restrict=1
kernel.printk=3 3 3 3
kernel.unprivileged_bpf_disabled=1
kernel.kexec_load_disabled=1
kernel.core_pattern=|/bin/false
kernel.sysrq=4
kernel.unprivileged_userns_clone=0
kernel.perf_event_paranoid=3
kernel.yama.ptrace_scope=2
kernel.ctrl-alt-del = 0
kernel.kptr_restrict = 2
kernel.maps_protect = 1
kernel.msgmax = 65535
kernel.msgmnb = 65535
kernel.pid_max = 65535
kernel.randomize_va_space = 2
net.ipv4.conf.all.bootp_relay = 0
net.ipv4.conf.all.forwarding = 0
net.ipv4.conf.all.log_martians = 1
net.ipv4.conf.all.proxy_arp = 0
net.ipv4.conf.default.forwarding = 0
net.ipv4.conf.default.log_martians = 1
net.ipv4.conf.lo.log_martians = 0
net.ipv4.icmp_echo_ignore_all = 1
net.ipv4.icmp_echo_ignore_broadcasts = 1
net.ipv4.icmp_ignore_bogus_error_responses = 1
net.ipv4.ip_forward = 0
net.ipv4.tcp_fin_timeout = 15
net.ipv4.tcp_keepalive_intvl = 15
net.ipv4.tcp_keepalive_probes = 5
net.ipv4.tcp_sack = 0
net.ipv4.tcp_syncookies=1
net.ipv4.tcp_rfc1337=1
net.ipv4.conf.all.rp_filter=1
net.ipv4.conf.default.rp_filter=1
net.ipv4.conf.all.accept_redirects=0
net.ipv4.conf.default.accept_redirects=0
net.ipv4.conf.all.secure_redirects=0
net.ipv4.conf.default.secure_redirects=0
net.ipv4.conf.all.send_redirects=0
net.ipv4.conf.default.send_redirects=0
net.ipv4.conf.all.accept_source_route=0
net.ipv4.conf.default.accept_source_route=0
net.ipv4.tcp_timestamps=0
net.ipv4.tcp_slow_start_after_idle = 0
net.ipv4.tcp_syn_retries = 5
net.ipv4.tcp_synack_retries = 2
net.ipv6.conf.all.accept_ra=0
net.ipv4.tcp_tw_reuse = 1
vm.mmap_rnd_bits=32
vm.mmap_rnd_compat_bits=16
vm.unprivileged_userfaultfd=0
vm.dirty_background_ratio = 5
vm.swappiness = 30
vm.overcommit_ratio = 50
vm.overcommit_memory = 0
vm.mmap_min_addr = 4096
vm.min_free_kbytes = 65535
net.unix.max_dgram_qlen = 50
fs.protected_symlinks=1
fs.protected_hardlinks=1
fs.protected_fifos=2
fs.protected_regular=2
fs.file-max = 65535
fs.suid_dumpable = 0
net.core.bpf_jit_harden=2
net.core.default_qdisc = fq
net.core.dev_weight = 64
net.core.netdev_max_backlog = 16384
net.core.optmem_max = 65535
net.core.rmem_default = 262144
net.core.rmem_max = 16777216
net.core.somaxconn = 32768
net.core.wmem_default = 262144
net.core.wmem_max = 16777216
dev.tty.ldisc_autoload=0
I'm usuing:
Linux Mint 21.2 Victoria

"Session" = GUI?

You can login fast to terminal? If yes: start GUI from terminal to check where is the delay. Issue to disable auto-gui.

What about to revert the changes?

strace startx, opened a nex desktop session, telinit 3 booted system and i couldn't login with my superser account, but could with other accounts.