I just got a new z83-4 Home and 4k performance is really horrible. 4k mkv videos and 4k youtube videos all play but with a lot of lag and stuttering. I've tried a fresh install with latest firmware but still the same issues. These same files play on my U9 with no problems. The z83-4 is supposed to play 4k no problems so does anyone have any ideas? Or could I have a defective machine?
What's your source? (HDD, SSD, USB flash, digital cards, NAS, etc.?)
Are the source files themselves SDR or are you using HDR files despite the Z83-4 not being HDR capable anyway?
What's the audio format of the files?
Have you tried an advanced settings XML file with Kodi?
Is your Kodi relatively light or loaded up with builds or heavy add-ons?
If you're streaming over your LAN, obviously that's yet another kettle of fish altogether too!!!
Do you have antivirus apps, anti malware, or a full security suite installed? (Some can seriously hog resources, for example.)
Please give more information on what you have or haven't tried so far too!! There's potentially a lot of variables involved
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