@doctorowl They are probably part of a page you've visited, that's why they are on the cache directory.
Do you have the start page with news enabled? maybe it could be related to the ads displayed there.
So playing locally saved files (through the Windows media player AND through opera) does NOT cause lags. I can watch them without lagging. Right now playing YOUTUBE Videos works totally fine. I think Netflix is the problem. Netflix in Edge & Internet Explorer & Opera is causing laggs. Nothing else does.
So there is no Opera-specific problem, but one that affects all browsers equally in connection with Netflix.
Possibly, but this is only a speculation, these delays are due to Netflix checking the network traffic (periodically) for the possible use of VPNs . Since Netflix is not free, their customer service team should be interested in helping you with that issue.
The only driver I ever updated is BIOS and Graphics (today). Which drivers should I check aswell?
Especially with Windows 10 all drivers should be kept up to date, because the various operating system updates often entail far-reaching changes to which the drivers (for motherboard, sound card, printer, WLAN, Bluetooth devices, etc.) must be adapted. For security reasons, drivers that are up-to-date are also recommended.
@leocg Yes it happens for all video and even with everything else reset
I've also unstalled and reinstalled Opera but it won't fix it
Just like this post https://forums.opera.com/topic/28598/video-pop-out-issue