Is it possible to free memory or somehow check if is there any memory "hanging up" somewhere in my system?
I have 16Gb of memory in a laptop and I have no so called heavy programs running. I have a few programs running though, like Discord, Skype, Telegram, irssi, rtorrent Chromium (like 15 tabs open), AnyDesk, Atom (text editor) and not much more and I always have indication from htop of being using 12Gb of memory and more. Swap also shows up pretty used. Of 4.87Gb, almos 3Gbs are being used.
Isn't this too much for what I have running in my laptop? Can I check if is there anything wrong with memory usage or swap usage? What can I do to at least check if this is ok?
This is how my htop looks like:

Why Chromium has that red time value? Why is it in red?