Videos not working on my MacBook Air.

Any non-Apple "anti-virus", "cleaning", or "Internet security" products including "banking security", anything at all in that broad category of utterly useless garbage? Same idea applies.

If all else fails, EtreCheck: How to run the Etrecheck Diagnostic Tool - Apple Community. Post its report in a reply to this Discussion, in accordance with those instructions.

"Videos not working on my MacBook Air.: After latest update my MacBook Air won’t play any videos properly, including anything from different platforms. The videos(movies,shows etc) are extremely laggy and unwatchable. I’ve been looking for an answer for a few days now and I have tried to fix it but I can’t seem to find the cause or the solution."

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Lagging Streaming Videos:

A. Any Luck Later in the Day?

Tried this later on after your most-recent reply? Any difference? It might be an issue on Apple's side.

B. Boot in Safe Mode:

In Safe Mode, Login Items do not open at Login, and certain caches are set aside so that items open as expected.

C. Restart your Modem and Router:

If there are servicing recently, then that can get in the way. So, powor off your modem and router for 30 seconds, and then power them back on.

D. Add the Connection Back:

Go into your network settings, and remove the network, then, add it back.

E. Report this to Apple:

Do your Part: Report this to Apple. Apple may not get back to you directly, but the more feedback Apple receives on this, the more they will know what is going on, and what needs to be fixed in upcoming updates.

1. Go Here: Feedback - macOS- Apple
2. Select: "Bug Report" for the "Feedback Type"
3. Comment: that this all started after installing an update, and how you have troubleshot it thus far. Include the URL to this thread.
4. Proceed from there as necessary

Streaming videos, or...?

If you are streaming content over the Internet, consider the effects of VPNs and similar factors that can contribute to slow / laggy streaming. If you use such things, don't.

Yes streaming videos is exactly what I meant. And that’s the thing I don’t use or have ever used any VPNs or anything similar.