Why does linux lag?

Question

linux

The computer lags a lot, the processor load is almost always under 100%: although there are no processes that would use the CPU a lot: It especially lags at system startup (and in general the boot itself takes about 7 minutes) and when exiting sleep mode (maybe 5 minutes from it exit), calling dialog boxes also causes difficulties and, in general, the responsiveness of the system leaves much to be desired.
I can not find the reason, top also did not show processes that would take a lot of CPU.
What could be causing this behavior and how to detect it? What do you advise to do?
Device Model: Dell Inspiron 13 5378
Features: Intel Core i5 2*2.5 GHz, 8GB DDR4 2400 MHz
OS: KDE neon 5.13

Answer 1

Still, I would like to look at the output of the top utilities (or rather htop). And before that, I will assume that either the disk is covered with you, or some processes go into swap. If the monitor shows a large load, then it really is.

Answer 2

Try kernel 4.13 and up.

Answer 3

Output htop to the studio.
And what else do you have with the RAM at this moment?
Do the sneakers themselves hang at the same time? Does the Vinch indicator light up constantly at this moment?
What hard drive, normal or SSD?

Answer 4

I would look not at top, but at vmstat - this will give the direction of the search, which resource is slowing down.

Answer 5

Lags on Linux are usually due to disk loading. It doesn't show up in htop. Look at the bulb on the case.
And your computer is almost old. If you need speed, I would advise you to install Xubuntu. (Not to be confused with Lubuntu!)
And you have PyCharm running, it's in Java. Try to install an alternative Java compiler (done with one command). I don't remember the details, but there are two of them from Oracle and another one that differs in speed.