Question / Help High CPU usage using "Browser Source" instead of "Media Source"

[blastarrow20]

I'm currently using StreamElements Overlays editor for both alerts/goals and video overlays.
In my main scene I have 2 browser sources with everything inside them and the CPU usage is over 40/45%.
Using the same exact videos as media sources otherwise take only 25/30%.
In the settings I've already activated set Nvidia NVENC and Hardware Accel. for browser source, and every other setting is ok.
I'm wondering why the same exact video, in a browser source, take almost double the power required for it as media source.
This issues is affecting me and a friend.
My and my friend pc spec are:
-i7 7700k and i7 9700k
-16GB 3200MHz (2 dimms) for both
-1050ti (soon 2060) and RTX 2080

PS: sorry if I made some errors, English isn't my first language.

 

[R1CH]

Browsers are less efficient than media sources because you have the overhead of a whole web browser. The video formats may also not be hardware decoded by the browser.

 

[blastarrow20]

Browsers are less efficient than media sources because you have the overhead of a whole web browser. The video formats may also not be hardware decoded by the browser.

The video format used in browser and media source are webm in both cases.
So using SE browser overlay is useless as a easy way to reduce the load on the cpu/gpu because it's less efficient?