Hello guys! I love Slackware system but it uses init that causes load slow. I don't want to install systemd because it looks weird. I was wondering is there any solution to load faster? Like parallel loading?

Using init doesn't cause slow loading. Also, parallel loading is already used in places that could help in the slackware startup. Parallel loading is not a unique or new thing by any means. All the boxes I use boot within 10 seconds (including post) using stock slackware and old hardware. But I don't reboot my systems unless I have to as well and always suspend. So this drive to shave off another second is very strange. How much faster do you need booting to be?

I was curious since I thought about it. My phone takes 25 seconds to boot to a point it is usable. And it's newer than my PCs. Even my Pi 1 with slackware is faster.

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You should use hibernation or suspend to disk of you are worried about boot times. Anyway, what is a few extra seconds during system boot up? You only boot up your machine once per day, I assume. Maybe you just need to tailor your Slackware boot scripts a bit so that less things are starting up during boot?

Anyway, you might find this page helpful: booting-faster

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Pretty dated advice, evidenced by the hotplug entry. Was hotplug really slow? I dunno, never really used it much.

Most edits shown there are unnecessary in current versions. The inet1 change depends on what his needs are. I think most desktop users use NetworkManager. You could also tweak the options to dhcpcd using the .conf file, so no edits are needed. I use static IP at home, so I never worry about having a dhcp server running to get an address.

It looks like lilo compact is not the default still. Might be okay to try. But that's if the OP it not using UEFI, which it that case, again, this suggestion doesn't matter, he already has a fast boot.

OP should describe a little more what is slow.

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Thanks everyone for great answers! Now I have already increased boot time.

another way to speed up booting is to use make native when building a custom kernel
build all the modules that support the hardware built in to the computer in to the kernel
build all the modules for stuff like USB as modules

go to /usr/src/linux* do a make native then do a make menuconfig and trim the kernel to suite the machine and you

this alone will cut your boot time in half

To confirm, lilo still does not use compact by default. But in my 15+ years of using Slackware, I've always added that option to every computer using lilo and never ran into a problem with it.