Thanks for clarifying these subjects

.
To get back to testing, I've been using Mint Mate for several weeks, and one thing I've been trying to track/trace is, what causes second long freezes every few minutes or so, when watching Youtube videos using Brave.
I know this is nitpicking, but it's kind of an annoyance. I don't remember that happening in Pop OS (which uses Gnome as a default DE), so perhaps it's more like distro or DE (desktop environment) -related component thing.
So I assume, that there are some background service(s), which can't be handled through Mate's control center --> startup applications. They simply aren't shown there. But it feels like there's timer-related or intermittent service(s) using certain resources with high priority, causing the hiccups.
To get a list of services, that use timer, can be seen by entering command:
systemctl list-timers --all
In my current system, there's 12 of them:
motd-news.timer motd-news.service
fwupd-refresh.timer fwupd-refresh.service
anacron.timer anacron.service
apt-daily.timer apt-daily.service
dpkg-db-backup.timer dpkg-db-backup.service
logrotate.timer logrotate.service
an-db.timer man-db.service
plocate-updatedb.timer plocate-updatedb.service
apt-daily-upgrade.timer apt-daily-upgrade.service
systemd-tmpfiles-clean.timer systemd-tmpfiles-clean.service
e2scrub_all.timer e2scrub_all.service
strim.timer fstrim.service
To get started, one on the top, 'motd-news.timer', is described as "'MOTD ? Message of the Day. "motd-news" is a package that makes a call periodically to Canonical servers to get updated news for support and informational purposes."
Source:
https://canonical.com/legal/motdOn that page is also instruction of how to disable that service, so I assume it's safe to do so.
...But the file mentioned in that page doesn't exist in my current system at all, so I created it, adding entry 'ENABLED=0 to it, and rebooted, but that service was still there. Not sure why it doesn't work in this distro/DE. Maybe it does with 'bigger' Ubuntu based distros?
Anyway, alternative way to disable it (and service related to it), is to enter commands:
sudo systemctl disable motd-news.service
sudo systemctl disable motd-news.timer
And to make sure that they don't get automatically triggered/started again, is by masking them:
sudo systemctl mask motd-news.service
sudo systemctl mask motd-news.timer
Reboot to apply the changes.
We'll see how that goes.