I have been using this laptop (Dell inspiron 15r SE) since more than 4 years and it has worked flawlessly.
Although recently I have noticed that while streaming on any browser at more than 720p@60 the video starts to lag behind the audio and it becomes quite annoying.
As a temporary fix I have to seek it back or forward a couple seconds before it re-syncs but later it starts desyncing again.
The native resolution has been FHD and I have a decent internet connection.
I use Firefox(Beta) natively but have also tried to stream on chrome but the problem persists.
Also to confirm that it wasn't the hardware that was grossly outdated I played a native 1080p video without any syncing issues.

Any help regard this would be great.