Maybe it helps if you use
use_locks 0in the config file?
Bingo! Thats fixed it! Thank you!
Its not that fast, but that depends of course from the connection. Maybe rclone is easier here and faster?
I haven’t done any benchmarks between the two - but while rclone is a really cool tool, speed isn’t really one if it’s main features IME 
But it has a large number of tunables and options to play around with. And of course it supports a great many cloudy backends and other features.
I dont need syncing, my NAS has a 2TB HDD and is almost full. My Sony X Compact has 32gb + 64GB MicroSD, so not enough Space for full sync but with davfs2 luckily not necessary. Thankfully most Apps allow save Big Data on MicroSD, for example the Offline Maps of Pure Maps.
I am still surprised how brave the X Compact is in terms of Speed. Its not that slow you would expect from a End 2016 Device. I spend it a new original Battery, now its last 36 - 45 hours. The Sony Batterys have very good Build Quality and last very long in Lifetime. Thats maybe one Reason why Sony Smartphones are a little bit more Expensive like the Competition.
What I meant is that rclone has, in addition to all its syncing features, a mount function which works almost exactly like davfs (but can mount more than just DAV but any backend).
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Does rclone mount deal with samba as a backend? I’m reading now, but suspect you will be faster.
Yes, or rather
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Q: Does WebDAV mirror the whole content of the netdrive to the Sailfish phone and use huge memory space on the phone? Or does it only access the netdrive and show it’s content and copies to the phone only on request?
If it’s a mount, it just shows the contents and shouldn’t copy anything. Did you mean a mount or a sync?
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Yes, the second (plus a bit of caching).
There is no persistent storage.
If you unmount it it’s “gone”
That is true for both davfs and rclone mount.
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It’s gone as a mount! But the storage remains persistent, where ever it was. If you write to that mount and unmount it, the data you wrote to it will persist.
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Success! Everything works like a charm!
I did exactly what @nephros wrote from step 1b (chum was yet installed) to step 8 using a Nextcloud account. Naturally, with tears in my eyes, I had to change nemo into defaultuser, but the rest was C+P and worked at the first try! It’s a little bit slow and it doesn’t refresh directory info realtime, but in general it does exactly what I want!
Thank you so much @nephros and @poetaster
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Unfortunately I can’t mount or umount as defaultuser any more! It only works in terminal as devel-su, and then i get a lot of error messages, e.g.
/sbin/mount.davfs: Warnung: der Server kann Dateien nicht sperren
but despite it still works as long as I mount/umount as devel-su in terminal. So, not completely damaged and still hope to make it running for daily driving sometimes.
edit: after the first crash i did deinstall everything and tried to reinstall davfs2 again following @nephros suggestions # 2 .There came some error messages and reinstallation was not possible. So I installed the package with Storeman, davfs2 version 1.5.6-1 again. Is this the right version?
That error about locking is normal and I thnk harmless.
About the OR vs Chum version I’ll have to check what changed.
Are you saying 1.5.x (openrepos) works fine but 1.6.x (chum) does not?
The OR version currently doesn’t work on the Xperia 10, but this may also have other reasons, will say maybe i’ve made some mistakes. Tomorrow I will check again all details.
On the Volla it reported ‘package is yet installed’, so I did not install any package but only create the mountpoint and do the rest until # 8 in the list.
davfs is not listed in Settings/product info/installed packages. edit: on both Xperia 10 and Volla.
(deleted outdated info) But it’s working on the Volla. But it is SLOW!
edit: on X10 it’s version davfs2-1.6.1-1.4.1.jolla.armv7hl ,
on Volla it’s version davfs2-1.6.1-1.4.1.jolla.aarch64
edit: On X10 i deleted the ~/.davfs folder, deinstalled the package with pkvon, and then reinstalled again following # 1b to 8 and now it’s working again.
Thank you all!