Lightweight browsers not really lightweight?

Hello everyone,
I decided to test out some of the so called lightweight browsers like Midori, PaleMoon and QupZilla. I was expecting some significant differences in either CPU, GPU or Memory Usage. I opened the same 4K YouTube video on all browsers including Firefox.
One browser Midori wasn't even able to play 4K videos by default so I immediately uninstalled it.
PaleMoon used just as much memory as Firefox and more CPU than Firefox, less GPU than Firefox.
QupZilla used a little bit less memory than Firefox, but more CPU and more GPU.

System:
Win 8.1
Intel i7 4770k
32GB Corsair Vengeance Pro 2400Mhz
XFX R9 290
Samsung 840 Pro

I know this is not a real benchmark since I haven't posted any data, but I didn't think it was worth the time since the results were so frustrating...

Any idea why these so called lightweight browsers aren't performing any better?
Thanks.

I once dabbled in these browsers (except QupZilla), but in the end I found them less convenient than "light weight". I hate to say it but I kind of like Edge, but it still has some compatibility issues here and there. I've heard Chrome is removing some of its bloat too and it has been extremely stable / quick for me lately.

I haven't moved to Windows 10 yet so I haven't tried Edge yet.
Even if it is good I'd like to have an alt browser that doesn't spy and doesn't create such a huge footprint.
For example as you may know, a browser creates a traceable fingerprint based on version, OS, addons etc.
Additionally I'm pretty sure the larger companies track you by additional means as well.

"lightweight" is about install size and feature set; not about RAM usage.

Yups, in all sorts of fancy ways. This might be interesting: http://www.pcworld.com/article/192648/browser_fingerprints.html

Yeah, check this out if you don't already know it:
https://panopticlick.eff.org/

  1. That's not true at all. Most if not all of those web browsers claim faster load speeds and lower resource usage.
    From wiki: "A lightweight web browser is a web browser that sacrifices some of the features of a mainstream web browser in order to reduce the consumption of system resources, and especially to minimize the memory footprint."
  2. It doesn't make any sense. Why would anyone make a browser that has less features but uses just as much resources.

Midori: "Midori is a lightweight, fast, and free web browser. It aligns well with the Xfce philosophy of making the most out of available resources."

QupZilla: "But from its start, QupZilla has grown into a feature-rich browser."
Wiki: "It is reported to consume fewer system resources than the major general purpose browsers like Mozilla Firefox and Google Chrome."

Do your research...

Hahaha, good one.

But seriously: It doesn't make sense to test the "lightweightness" of browsers on a system with that horsepower. If there is free memory and the browser could do things faster by using it, it will do that. And that is fine.