Sometimes my system is really slow after reboot

It has done this several times. Here’s the scenario:
Yesterday after a shutdown, I turned my system back on and it. was. in. super. slow. mode. Everything is slow, launching applications, typing in the terminal (kitty). Checked journalctl and didn’t see anything unusual.
Rebooted, and it’s working fine. Nice and responsive.
I extracted the logs from journalctl after the slow boot, and for the normal boot. I didn’t see anything obvious. Some of the things being set up are in a different order, but nothing egregious. Of course there are thousands of lines and I may have missed something.

I’m realize this is not a lot to go on, but I’m not sure where to investigate further. One thing I can do is Ctrl+Alt+F3 and try a terminal to see if the problem is gnome/X, but haven’t tried this yet.

Thanks for any suggestions!

at 08:21:40 > fastfetch -l none                                                                         
john@beast                                                                                              
----------                                                                                              
OS: EndeavourOS x86_64                                                                                  
Kernel: Linux 6.6.40-1-lts                                                                              
Uptime: 11 hours, 58 mins                                                                               
Packages: 1495 (pacman), 28 (flatpak), 62 (brew)                                                        
Shell: zsh 5.9                                                                                          
Display (LG Ultra HD): 3840x2160 @ 60Hz                                                                 
Display (LG SDQHD): 2560x2880 @ 60Hz                                                                    
Display (LG Ultra HD): 3840x2160 @ 60Hz                                                                 
DE: GNOME 46.3.1                                                                                        
WM: Mutter (X11)                                                                                        
WM Theme: Adwaita                                                                                       
Theme: Adwaita [GTK2/3/4]                                                                               
Icons: Qogir [GTK2/3/4]                                                                                 
Font: MonaspiceAr Nerd Font Medium (13pt) [GTK2/3/4]                                                    
Cursor: Qogir (24px)                                                                                    
Terminal: sshd-session                                                                                  
CPU: 13th Gen Intel(R) Core(TM) i9-13900K (32) @ 5.80 GHz                                               
GPU 1: NVIDIA RTX A4500                                                                                 
GPU 2: Intel Arc A380 @ 2.45 GHz [Discrete]                                                             
Memory: 75.07 GiB / 125.50 GiB (60%)                                                                    
Swap: Disabled                                                                                          
Disk (/): 195.10 GiB / 357.63 GiB (55%) - btrfs                                                         
Disk (/home): 369.99 GiB / 1.47 TiB (25%) - btrfs                                                       
Disk (/mnt/backup_8t): 2.07 TiB / 7.28 TiB (28%) - btrfs                                                
Disk (/mnt/nvme): 1.25 TiB / 3.64 TiB (34%) - btrfs                                                     
Disk (/mnt/tank): 22.43 TiB / 42.16 TiB (53%) - zfs
Disk (/run/media/john/backup): 930.80 GiB / 931.51 GiB (100%) - btrfs
Local IP (wlan0): 10.0.0.47/24
Locale: en_US.UTF-8

This happened again yesterday.
I had to reset 3 times before the system ran normally.
I couldn’t switch to a tty (eg. Ctrl+Alt+F3), as the screen was blank.

I’ve noted you’re running the LTS kernel, but on quite recent hardware. You might consider running the standard kernel, to ensure you’re receiving full support for more cutting edge hardware features.

Keep the LTS around of course, it’s useful as a backup option.

Could it be this causing an issue?

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Thanks for the suggestions.
It seems that when this is happening, if I completely power down, the system will run normally after booting up. Only tried this once so far, so not enough data yet.

I tried having a non-LTS kernel around for backup, but it was screwing up the zfs module when the kernel was updated, so I finally just removed the non-LTS kernel, and all is good.

Good eye! That’s a backup disk, so won’t affect this.

maybe enable swap memory even a small amount of swap should help speed things up

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