How Can I Speed Up My Linux Boot Time Even More?

Honestly, a boot time of 20 seconds isn't bad at all! Most people would be quite happy with that. If you're really set on improving it, though, you might want to look into configuring some services to start later or disabling ones you don’t need. Just remember, there’s a limit to how much you can optimize based on your hardware.

One option could be to remove LightDM and log in from the command line instead. It’s a bit more barebones but could help speed things up slightly. However, after that, your options for improvement will get limited mostly by your hardware.

If you're feeling adventurous, you could try switching to a systemd-less distro, like Void Linux. It might cut down your boot time since systemd can add extra overhead. But keep in mind this route would require learning and tweaking, so be prepared for a little work to get everything just right!

I see you mentioned you have an SSD, which is great for speed. But if it's just a 256GB SSD and your system is running well, it might be difficult to shave off more seconds. Have you checked which services take the longest to load? You could potentially disable or delay some of them to speed things up a bit.