Thanks for the answer! The result of systemd-analyze blame is:
3.082s cups.service
3.048s NetworkManager-wait-online.service
2.224s sys-devices-pci0000:00-0000:00:1f.2-ata2-host1-target1:0:0-1:0:0:0-block-sdb-sdb1.device
2.224s dev-disk-by\x2did-wwn\x2d0x5000039ff4e8ea56\x2dpart1.device
2.224s dev-disk-by\x2dlabel-STORAGE.device
2.224s dev-disk-by\x2dpath-pci\x2d0000:00:1f.2\x2data\x2d2.0\x2dpart1.device
2.224s dev-disk-by\x2dpartuuid-be23c57a\x2d35af\x2d4f02\x2d9d04\x2dc4d6cc3334e2.device
2.224s dev-disk-by\x2dpath-pci\x2d0000:00:1f.2\x2data\x2d2.0\x2dpart-by\x2dpartnum-1.device
2.224s dev-disk-by\x2dpath-pci\x2d0000:00:1f.2\x2data\x2d2.0\x2dpart-by\x2dpartlabel-Linux\x5cx20filesystem.device
2.224s dev-disk-by\x2dpath-pci\x2d0000:00:1f.2\x2data\x2d2\x2dpart1.device
2.224s dev-disk-by\x2dpath-pci\x2d0000:00:1f.2\x2data\x2d2.0\x2dpart-by\x2dpartuuid-be23c57a\x2d35af\x2d4f02\x2d9d04\x2dc4d6cc3334e2.device
2.224s dev-disk-by\x2ddiskseq-2\x2dpart1.device
2.223s dev-disk-by\x2duuid-aba4e227\x2d25b1\x2d442c\x2dbea6\x2d9b5d1975a8f7.device
2.223s dev-disk-by\x2dpath-pci\x2d0000:00:1f.2\x2data\x2d2.0\x2dpart-by\x2duuid-aba4e227\x2d25b1\x2d442c\x2dbea6\x2d9b5d1975a8f7.device
2.223s dev-disk-by\x2did-ata\x2dTOSHIBA_DT01ABA300_Y4JX07SGS\x2dpart1.device
2.223s dev-sdb1.device
2.223s dev-disk-by\x2dpath-pci\x2d0000:00:1f.2\x2data\x2d2.0\x2dpart-by\x2dlabel-STORAGE.device
2.223s dev-disk-by\x2dpartlabel-Linux\x5cx20filesystem.device
2.171s dev-disk-by\x2did-ata\x2dTOSHIBA_DT01ABA300_Y4JX07SGS.device
2.171s dev-disk-by\x2dpath-pci\x2d0000:00:1f.2\x2data\x2d2.0.device
2.171s dev-disk-by\x2did-wwn\x2d0x5000039ff4e8ea56.device
2.171s dev-disk-by\x2ddiskseq-2.device
2.171s dev-sdb.device
2.171s dev-disk-by\x2dpath-pci\x2d0000:00:1f.2\x2data\x2d2.device
2.171s sys-devices-pci0000:00-0000:00:1f.2-ata2-host1-target1:0:0-1:0:0:0-block-sdb.device
2.128s dev-disk-by\x2ddiskseq-1\x2dpart1.device
2.128s dev-sda1.device
2.128s dev-disk-by\x2dpath-pci\x2d0000:00:1f.2\x2data\x2d1.0\x2dpart-by\x2duuid-3F90\x2dDB11.device
2.128s dev-disk-by\x2dpath-pci\x2d0000:00:1f.2\x2data\x2d1.0\x2dpart-by\x2dpartnum-1.device
2.128s dev-disk-by\x2dpath-pci\x2d0000:00:1f.2\x2data\x2d1.0\x2dpart1.device
2.128s sys-devices-pci0000:00-0000:00:1f.2-ata1-host0-target0:0:0-0:0:0:0-block-sda-sda1.device
2.128s dev-disk-by\x2did-wwn\x2d0x5001b444a8d679a9\x2dpart1.device
2.128s dev-disk-by\x2did-ata\x2dSanDisk_SDSSDA\x2d2T00_1943D9454509\x2dpart1.device
2.128s dev-disk-by\x2duuid-3F90\x2dDB11.device
2.128s dev-disk-by\x2dpath-pci\x2d0000:00:1f.2\x2data\x2d1.0\x2dpart-by\x2dpartuuid-aad8014c\x2d6487\x2d4af1\x2da04d\x2d6d560e52717a.device
2.128s dev-disk-by\x2dpartuuid-aad8014c\x2d6487\x2d4af1\x2da04d\x2d6d560e52717a.device
2.128s dev-disk-by\x2dpath-pci\x2d0000:00:1f.2\x2data\x2d1\x2dpart1.device
2.124s dev-disk-by\x2dpath-pci\x2d0000:00:1f.2\x2data\x2d1.0.device
2.124s dev-disk-by\x2did-wwn\x2d0x5001b444a8d679a9.device
2.124s dev-disk-by\x2ddiskseq-1.device
2.124s dev-disk-by\x2dpath-pci\x2d0000:00:1f.2\x2data\x2d1.device
2.124s dev-disk-by\x2did-ata\x2dSanDisk_SDSSDA\x2d2T00_1943D9454509.device
2.124s sys-devices-pci0000:00-0000:00:1f.2-ata1-host0-target0:0:0-0:0:0:0-block-sda.device
2.123s dev-sda.device
2.118s dev-disk-by\x2dpath-pci\x2d0000:00:1f.2\x2data\x2d1.0\x2dpart2.device
2.118s dev-disk-by\x2dpath-pci\x2d0000:00:1f.2\x2data\x2d1\x2dpart2.device
2.118s dev-sda2.device
2.118s dev-disk-by\x2did-ata\x2dSanDisk_SDSSDA\x2d2T00_1943D9454509\x2dpart2.device
2.118s dev-disk-by\x2dpath-pci\x2d0000:00:1f.2\x2data\x2d1.0\x2dpart-by\x2dpartuuid-f6b0ec9e\x2dda80\x2d480b\x2db28d\x2db52a0867c064.device
2.118s dev-disk-by\x2did-wwn\x2d0x5001b444a8d679a9\x2dpart2.device
2.118s dev-disk-by\x2dpath-pci\x2d0000:00:1f.2\x2data\x2d1.0\x2dpart-by\x2dpartnum-2.device
2.118s sys-devices-pci0000:00-0000:00:1f.2-ata1-host0-target0:0:0-0:0:0:0-block-sda-sda2.device
2.118s dev-disk-by\x2ddiskseq-1\x2dpart2.device
2.118s dev-disk-by\x2dpartuuid-f6b0ec9e\x2dda80\x2d480b\x2db28d\x2db52a0867c064.device
2.100s sys-devices-platform-serial8250-serial8250:0-serial8250:0.2-tty-ttyS2.device
2.100s dev-ttyS2.device
2.092s sys-devices-platform-serial8250-serial8250:0-serial8250:0.3-tty-ttyS3.device
2.092s dev-ttyS3.device
2.082s sys-devices-platform-serial8250-serial8250:0-serial8250:0.1-tty-ttyS1.device
2.082s dev-ttyS1.device
2.075s dev-ttyS0.device
2.075s sys-devices-platform-serial8250-serial8250:0-serial8250:0.0-tty-ttyS0.device
2.038s sys-module-configfs.device
2.014s sys-module-fuse.device
1.097s vboxdrv.service
811ms apparmor.service
792ms initrd-switch-root.service
665ms snapd.service
616ms containerd.service
613ms NetworkManager.service
593ms udisks2.service
480ms upower.service
412ms mnt-aba4e227\x2d25b1\x2d442c\x2dbea6\x2d9b5d1975a8f7.mount
410ms snap-acestreamplayer-17.mount
409ms snap-acestreamplayer-18.mount
406ms snap-bare-5.mount
404ms snap-core-17284.mount
401ms snap-core-17292.mount
394ms polkit.service
389ms snap-core18-2979.mount
385ms snap-core18-2999.mount
380ms snap-core20-2717.mount
377ms snap-core20-2769.mount
373ms snap-core22-2339.mount
370ms snap-core22-2411.mount
359ms accounts-daemon.service
331ms snap-gnome\x2d3\x2d28\x2d1804-161.mount
326ms snap-gnome\x2d3\x2d28\x2d1804-198.mount
321ms systemd-udev-trigger.service
313ms snap-gnome\x2d3\x2d38\x2d2004-143.mount
306ms snap-gnome\x2d42\x2d2204-226.mount
295ms snap-gnome\x2d42\x2d2204-247.mount
272ms systemd-resolved.service
265ms snap-gtk\x2dcommon\x2dthemes-1534.mount
259ms user@1000.service
253ms systemd-timesyncd.service
245ms snap-gtk\x2dcommon\x2dthemes-1535.mount
241ms aa-lsm-hook.service
227ms snap-iptvnator-90.mount
220ms snap-iptvnator-92.mount
217ms systemd-logind.service
213ms systemd-localed.service
205ms dev-loop11.device
189ms systemd-journal-flush.service
189ms scx_loader.service
189ms dev-loop10.device
187ms dev-loop8.device
186ms ModemManager.service
185ms dev-loop9.device
180ms dev-loop5.device
175ms dev-loop7.device
174ms systemd-udevd.service
174ms systemd-hostnamed.service
169ms dev-loop6.device
168ms dev-loop20.device
165ms dev-loop22.device
164ms dev-loop3.device
163ms dev-loop21.device
159ms dev-loop0.device
158ms dev-loop4.device
157ms dev-loop2.device
157ms dev-loop1.device
155ms snap-pdftk-9.mount
154ms snap-snapd-26382.mount
151ms snap-snapd-26865.mount
149ms systemd-tmpfiles-setup.service
144ms dev-loop17.device
142ms tmp.mount
138ms rtkit-daemon.service
137ms systemd-homed.service
133ms teamviewerd.service
128ms clr-boot-manager-booted.service
128ms systemd-vconsole-setup.service
126ms systemd-journald.service
124ms dev-loop19.device
124ms switcheroo-control.service
116ms dev-loop16.device
115ms dev-loop18.device
114ms dev-loop15.device
113ms dev-loop12.device
112ms dev-loop14.device
110ms systemd-userdbd.service
109ms colord.service
109ms lvm2-monitor.service
106ms dbus-broker.service
103ms systemd-nsresourced.service
103ms dev-loop13.device
95ms systemd-modules-load.service
90ms systemd-timedated.service
83ms systemd-tmpfiles-setup-dev-early.service
79ms lightdm.service
60ms packagekit.service
57ms alsa-restore.service
54ms power-profiles-daemon.service
52ms dev-hugepages.mount
51ms dev-mqueue.mount
49ms sys-kernel-debug.mount
49ms systemd-remount-fs.service
47ms sys-kernel-tracing.mount
43ms systemd-rfkill.service
43ms systemd-tmpfiles-setup-dev.service
41ms systemd-network-generator.service
41ms kmod-static-nodes.service
39ms systemd-binfmt.service
38ms systemd-udev-load-credentials.service
37ms usr-merge.service
36ms systemd-user-sessions.service
34ms epoch.service
34ms systemd-boot-random-seed.service
34ms systemd-fsck-root.service
33ms systemd-random-seed.service
32ms modprobe@dm_mod.service
30ms modprobe@efi_pstore.service
30ms initrd-parse-etc.service
28ms systemd-sysctl.service
26ms systemd-boot-update.service
25ms initrd-cleanup.service
25ms systemd-sysusers.service
23ms modprobe@loop.service
22ms avahi-daemon.service
19ms swapfile.swap
19ms systemd-update-utmp.service
18ms docker.socket
17ms nordvpnd.socket
16ms modprobe@configfs.service
14ms proc-sys-fs-binfmt_misc.mount
13ms modprobe@drm.service
13ms user-runtime-dir@1000.service
12ms sys-fs-fuse-connections.mount
10ms systemd-hibernate-resume.service
10ms modprobe@fuse.service
9ms initrd-udevadm-cleanup-db.service
8ms pcscd.socket
7ms snapd.socket
59us systemd-homed-activate.service
I think that all systemd services are starting very fast, in 3 seconds. The boot sequence now is as follows: first the BIOS boot image, after that I can select in grub to boot Solus linux and then, it takes like 20 seconds without doing anything (the hard disk led indicator remains off) until the hard disk starts loading all systemddaemons, which takes around 3-4 seconds. How can I find out why the computer is waiting around 20 seconds from the grub booting screen to the start of doing anything in the hard disk? It is very annoying and it happens since one of the latest updates of Solus... Thanks for the help!
