thanks mate.I ordered a SanDisk Extreme Pro.My Kingston microSD has just 2MB/S Random read spead.Maybe this is the reason I have some lags on 720p Netflix streaming on Vorke Z6?Sandisk has 4MB/S random write speed.
SD card speed does not have any influence on Netflix streaming.
Internet speed, network speed, router, CE/Kodi background processes, box network card/drivers and video cache all influence NF streaming.
Have you tried with fresh install with only NF addon and video cache settings to see if that helps?
not yet mate. I am newbie to kodi,CE etc and these Cache settings looks Greek to me. (i am also Greek 
) Could someone tell me with steps what to do from all these described in the article above?
Between the maximum and sustained transfer rates:
A lot of cards on pages where you can buy them are mistakenly or especially described as they are very fast and itās true but there are two speeds
The maximum transfer rate of memory cards is only achieved for a small fraction of time when required by the memory card. This is in short bursts, for example when taking a very high resolution photo with a digital camera, the maximum rate is achieved.
The minimum or sustained transfer rates are much lower, for example when transferring a steady stream of data or running a speed test.
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If you are not able to set cache yourself, I can send you advancedsettings.xml file and you just have to download it copy it to proper folder and reboot.
Use this https://github.com/aenemapy/aenemapyrepo/tree/master/zips
addon name is ** EZ Maintenance + **
look at youtube how to use (I recommend automatic setting)
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send it if you want bro Lets try this solution firstā¦
Here it is Advanced Settings with video cache only.
Download, copy with Kodi File Manager to storage/.userdata folder and reboot to take effect.
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u mean storage/. kodi/userdata?
In fact to storage/kodi/.userdata 
I tryied but no difference 
What is the speed of your internet?
Donāt know how to help you furtherā¦
I have relative slow internet speed (from 10Mbits - 40Mbits on 4G depending on the time of the day) but all my boxes (S922x, S912, S905X and S905W) have NO problems at all with NF streaming. S905 and S912 use 720p without any problem, so it is possible, just donāt know what your problem is.
For the next step you should learn how to capture debug logs and post them here and on Netflix addon forumā¦
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thanks but i will try tomorrow with my New upcoming microSD card cause process seems difficult to me. I have a suspicious that lags may be from magisk.Does anyone had same experience?Also if i convert viper4a, reboot to libreelec,adaway to system apps,will they work ok after i uninstall magisk?
When you get your new uSD card make a fresh install. Do NOT restore anything. Configure Kodi with -> Expert mode -> show hidden files and folders, and so onā¦
Then install only ārepository.castagnait-1.0.0.zipā and from it only latest Netflix addon (V.0.15.5) and nothing else. Then try NF streams if you get the same lag.
If you do still have it, then itās your internet-router-local network or your hardware to blame - nothing to do with CoreElec-Kodi-Netflix addon. Nor has it anything to do with your Android installation.
Ok I found it!just a sec to post my results!
I am really very glad to announce you that my new sandisk extreme pro made the trick!Not only whole system just flyies wo lags,problems (video not able to resume etc) but now I play netflix on full hd and I canāt notice a single frame drop!!before I was playing at 720p.I noticed the difference in El Camino movie,when on 02:00 the water from lake was lagging a lot.Now is superd!Any way to test it further just to be sure?I heard something about planet earthā¦
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Finally 
The best (ultimate 
test is with Our Planet series. Play E1 scenes from 4min to 6min at 1080p with subtitles and look at Frame Skip counter. You must use old widevine decryption (libwidevinecdm.so version 4.10.1303.0) to get best results.
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Yes, first episode. Why it plays at 720p donāt knowā¦
Maybe itās due to āAutomaticā resolution settings in inputstream.helper. Set there āManualā and when the stream starts go to video settings (in player right icon at the bottom) and there choose resolutions that are available.