How to boost my server?

[hack3rcon]

Hello,
My server is so slow and when I want to write something is console then writing is delayed. I offer some information about my server and I'm thankful if anyone show me some ways to boost is:

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# free 
              total        used        free      shared  buff/cache   available
Mem:        3867856     3094076      628904       11392      144876      575532
Swap:       2170876     1382284      788592

And:

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# iostat
Linux 4.18.0-193.14.2.el8_2.x86_64 (System) 	10/17/2020 	_x86_64_	(4 CPU)

avg-cpu:  %user   %nice %system %iowait  %steal   %idle
           2.17    0.02    0.63    0.03    0.00   97.14

Device             tps    kB_read/s    kB_wrtn/s    kB_read    kB_wrtn
sda               3.51        44.39        45.40  203959475  208613480
dm-0              1.44        38.62        33.62  177484677  154477077
dm-1              4.36         5.74        11.69   26358028   53740852
dm-2              0.00         0.01         0.08      52746     354114

And:

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# vmstat 
procs -----------memory---------- ---swap-- -----io---- -system-- ------cpu-----
 r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa st
 1  0 1375628 539688     72 224988    1    3    11    11    1    2  2  1 97  0  0

And https://pastebin.fun/lCK8mah605 and https://paste.ubuntu.com/p/2yj2kdM5tB/.
I attached these images too:

Suricata.png (105.88 KiB) Viewed 1493 times

iotop.png (88.38 KiB) Viewed 1494 times

Thank you.

[tunk]

More memory, you're using 1.4GB swap.

[TrevorH]

Also the first sample from iostat/vmstat is an average since the system was booted so it's mostly useless. It's the subsequent samples that contain useful info.

[hack3rcon]

More memory, you're using 1.4GB swap.

How can I solve it without any reboot?

[hack3rcon]

In this situation, how can I troubleshooting it?

[tunk]

Shutdown server, switch off power, unplug power cable(s), install more memory, etc.

[BShT]

most of time for me delayed typing is a link usage or latency issue

but there will be a thousand factors to see, if you have a VM or a physical host, if your VM has shared resources and/or resources limitations

[hack3rcon]

This happened suddenly!!!

[hack3rcon]

How a Linux administrator solve this problem?

[tunk]

ps aux | sort -rn -k 4 | more
Fourth column is memory usage in %.