What I can see is that the RAM is almost completely in use. The screenshot was taken this morning after restarting the phone after an update. The following were open: WhatsApp, Mail program (GMX), Covpass app, Updater app, general settings, alarm clock, Google News, Threema.
After closing all Apps it looks better.
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Did you close all at once or one by one to see if its one specific App?
No, I press the right Software-Button, switch to the end of the row an press “close all apps”.
I think I will try the adb shell again if the Phone is really slow, the problem is that happens mostly when my PC is far away 
I’ve moved your posts to a new topic to keep the 6-y-FP2 thread on-topic…
At least on those screenshots I can’t see any critical HW usage: there’s no swap used, so it doesn’t seem that something has to be swapped because of missing memory (although I’m not sure that swap is used by Android at any time…).
And idle CPU% is at more than 300%, so there seem to be enough free CPU resouces.
Maximum CPU usage of a single process is at about 7%. So there’s no process running wild…
I suppose that at that moment when you created the output your FP2 was quite “chilled”. It’d be interesting to compare it to the output at moment when you have the impression that the phone is very slow (e.g. while it’s taking minutes to launch your Covid pass app).
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Just in case someone is trying to find that developer options… How to Enable Android 9.0 Pie Developer Options [Tutorial]
My phone says 1.1 GB of 2 GB memory used, but it is slow and it has accumulated 366 crash reports. In Debugging, the option to enable is USB debugging.
Then, you need to download the “Minimal ADB and Fastboot” from somewhere in the web (for Windows).
I have got similar results:
Tasks: 282 total, 1 running, 271 sleeping, 0 stopped, 0 zombie
Mem: 1920260k total, 1833936k used, 86324k free, 24296k buffers
Swap: 0k total, 0k used, 0k free, 374660k cached
400%cpu 7%user 16%nice 17%sys 359%idle 1%iow 0%irq 0%sirq 0%host
←[7m PID USER PR NI VIRT RES SHR S[%CPU] %MEM TIME+ ARGS ←[0m
4559 u0_a38 20 0 1.7G 52M 26M S 13.3 2.7 3:21.01 com.google.andr+
14860 shell 20 0 6.2M 2.0M 1.2M R 4.3 0.1 0:00.90 top
2475 system 18 -2 1.9G 163M 69M S 4.0 8.7 50:14.30 system_server
317 audioserver 20 0 26M 3.5M 1.0M S 3.0 0.1 1:29.63 android.hardwar+
345 audioserver 20 0 60M 5.8M 1.6M S 2.6 0.3 1:52.92 audioserver
329 system -3 0 105M 3.4M 1.3M S 1.6 0.1 1:41.36 android.hardwar+
7764 radio 20 0 1.0G 43M 27M S 1.3 2.2 1:34.60 com.android.pho+
3144 bluetooth 20 0 1.0G 39M 23M S 1.3 2.0 2:34.61 com.android.blu+
432 nobody 20 0 51M 1.6M 588K S 1.0 0.0 5:07.35 sensors.qcom
349 system -2 -8 112M 9.3M 3.7M S 1.0 0.4 12:58.23 surfaceflinger
8412 root 20 0 0 0 0 S 0.6 0.0 0:05.15 [kworker/u:0]
3975 u0_a17 20 0 1.3G 108M 50M S 0.6 5.7 21:12.03 com.google.andr+
14293 root 20 0 0 0 0 S 0.3 0.0 0:00.76 [kworker/u:7]
14132 root 20 0 0 0 0 S 0.3 0.0 0:00.48 [kworker/0:1]
13988 shell 20 0 12M 684K 516K S 0.3 0.0 0:00.06 adbd --root_sec+
25244 u0_a93 20 0 1.1G 68M 27M S 0.3 3.6 0:28.60 com.whatsapp
31304 u0_a33 20 0 1.1G 119M 67M S 0.3 6.3 9:09.26 com.android.sys+
4880 u0_a91 20 0 1.7G 110M 37M S 0.3 5.8 0:29.84 org.telegram.me+
3160 root 20 0 0 0 0 S 0.3 0.0 0:36.73 [MC_Thread]
Wirth law…
I’d say that is the|a problem, only 86Mb of memory left.
Can you move some data (videos, music, images) either to an external device or an externally formatted SD card. (As pointed out the figures for the RAM usage do not relate to this idea of moving data)
That’s not helpful. The numbers you quoted is the RAM not the flash storage.
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I am moving media out of the phone regularly, when Windows shows the drive in red. The responsiveness improves a bit after this, but not too much, thank you.
Ok? So of the 2Gb RAM used (19,202,260,000)
a) there’s a discrepancy between the two figures and
b) still an issue
c) I’ll amend the comment about moving data
As the figures were different I was thinking it was ‘memory’ but clearly not. Apologies.
How much memory do you have and use. Maybe you could move more? i.e. not so that the ‘red’ indicator disappears 
Can you save enough data that you can reset the phone, though that will require installing any custom apps again?
There is a discrepancy, indeed. The phone itself reports Memory used 1.1 GB in Developer Options menu, then with adb shell top it is consuming 1.8 GB.
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I have 5.18 GB free of 25.5 GB in the FP2, according to Windows Explorer, when I connect it to the laptop. I did what you mention, backup everything and factory reset, in summer 2020, because the situation was terrible, with constant slow down and crashes. After that, in the beginning it was going smoother, although not like a new phone, but as I was installing apps I really need to work with, it started to slow down again. I am now reaching the point that I am wondering whether I should factory reset again and see, but I am avoiding it, by now (lot of work with debatable result). I also suspect the battery is too old. When the battery is drained, the phone responsiveness is very bad. I have ordered new batteries. I am still trying to keep the FP2 working, before switching to FP4 with 5G (I have been skipping FP1 and PF3, just by chance). But I still don’t see the need to switch. I am keeping a second FP2 as backup since some time ago. I use it also to charge backup batteries I take away with me when I plan to be outside home for long. That device has not been touched since I factory reset it in summer 2020. It indicates 20.1 GB free of 25.4 GB and it still has Android 7:
adb shell top -n 1
User 4%, System 14%, IOW 1%, IRQ 0%
User 3 + Nice 0 + Sys 10 + Idle 53 + IOW 1 + IRQ 0 + SIRQ 0 = 67
PID USER PR NI CPU% S #THR VSS RSS PCY Name
26927 shell 20 0 14% R 1 4544K 1572K fg top
26058 u0_a89 20 0 13% S 59 1407104K 106464K bg org.mozilla.fennec_fdroid
1818 system 18 -2 2% S 146 1851260K 151324K fg system_server
270 system -2 -8 2% S 14 121016K 9512K fg /system/bin/surfaceflinger
3186 u0_a33 20 0 1% S 40 1245776K 133772K fg com.android.systemui
4062 root 13 -7 1% S 6 9988K 1452K fg /system/bin/mpdecision
…
I will switch to the backup phone as primary phone if the situation gets really bad (and I will update it to Android 9). I have reached the conclusion that the only way to have a highly reliable FP2 is to have two of them (and to carry spare batteries, because they get drained very fast now).
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I read some where a #kickstart can revitalise the battery.
Never sure about such an idea, but it may refer to the battery monitoring which may a) give false readings and b) stop it charging fully.
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I also carried a second battery to change fast. But not everytime that worked well. Sometimes the second battery drained very fast showing me a good level in the beginning. I also tried a extra Charger for the battery outside of the Phone, but I ended buying a 20.000 mAh power bank.
If you open the phone once a day to change the akku, you increase the risk of breaking the shell.
And I store a second Fairphone which is also my spare parts store
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The phone has an algorithm to assess the battery and keeps data on it. Plus the battery logs info to send to the algorithm.
If you switch batteries the stored data is not appropriate so charging can easily not be optimal. Hence the idea of kickstarting is useful.
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I already read about the kickstart and I think I will try. What you write is exactly what I have already suspected, namely that the battery or the smartphone has a kind of memory regarding the state of charge of the battery. Carrying a second battery is therefore not a suitable method against short battery runtimes.
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Mon FP 2 est également devenu de plus en plus lent malgré la dernière mise à jour début janvier. je dois fermer les applications en arrière plan si j’en ouvre une , sinon elle met trop de temps à s’ouvrir . La 4 G ne fonctionne pas toujours là oû sur un autre téléphone elle s’affiche!
Bon, l’utilisation principale: “téléphoner” fonctionne bien ! Je pense acheter le FP4 avant la fin de cette année 2022…
Translation Google :
My FP 2 has also become increasingly slow despite the last update in early January. I have to close background apps if I open one, otherwise it takes too long to open. 4G doesn’t always work where on another phone it shows!
Well, the main use: “telephone” works well! I am thinking of buying the FP4 before the end of this year 2022…