Also have a Dell 6410, it's a scrappy little thing. The brushed metal brick aesthetic is pleasing. It's probably time to go full linux on it.
If you are using Linux make sure you are using Wayland. For decent Youtube performance turn off "Ambient Mode" in the Web UI, it wrecks the video playback performance. The box shadow effect with the video playing on top of it is too much for these old iGPUs to handle.
Totem won't work properly in Gnome due to it not having a OpenGL 3.X compatible GPU. VLC will work fine. So just remove Totem and install VLC.