performance degradation Ubuntu/x64

[lazyest]

I hope someone knows, where to find the answer and help me. I have a small lenovo x200s note for kitchen to read some news, with Ubuntu x64, now its 17.10 with xorg. Since some moment one of the sites I'm reading began to freezes on watching. for example, this link is frozing https://realt.onliner.by/2018/01/21/futuris-4
I have 8 Gb of RAM so no memory restriction. Firefox/chromium is working fine. On moment browser is freezing we getting
CPU MEMORY

114,9 11,8 31:35.90 palemoon
16,8 1,2 11:25.25 Xorg

Any ideas?

[Night Wing]

My everyday computer is my trusty old (bought back in June of 2010) HPE-170 tower desktop computer. It has an Intel i7 processor on the motherboard with a speed of 2.80, 16 GB of memory with an old Nvidia GT 220 graphics card using a 340.102 linux driver.

I'm using 64 bit linux Pale Moon 27.7.1 running in 64 bit linux Mint 18.3 (Sylvia) Xfce. The only two extensions which are installed are the old NoSquint 2.1.9.1 and Ablock Latitude (4.0.1). I visited the site and there are lots of pictures on the page. I experienced no freezing of any kind. Not even any lagging. BTW, when I visited the page, Adblock Latitude was enabled (turned on).

[smoki]

for example, this link is frozing https://realt.onliner.by/2018/01/21/futuris-4

That comment system downthere uses a lot of CPU, actually scripts from:

https://www.onliner.by/

On that site also is slowmo for you, isn't it? and further:

https://createjs.com
https://gskinner.com

Probably it is just because of these html5 animated ads... Adobe Animate, WebGL, StageGL... EaselJS, so we need that StageGL to speed up these canvases as they are known to be slow

[Walter Dnes]

I've set both "media.autoplay.allowscripted" and "media.autoplay.enabled" to false. I have a "top" window open for diagnostics. When I open that site, "/usr/bin/X" immediately jumps to 80% cpu usage, and the Pale Moon instance itself jumps to approx 45% cpu usage. This is on my 2008 Intel Core2 Duo. Interesting note... when I switch to another tab, with onliner.by open in the background, both X and Pale Moon usage drop to normal. Hmmmmm.

[lazyest]

I've set both "media.autoplay.allowscripted" and "media.autoplay.enabled" to false. I have a "top" window open for diagnostics. When I open that site, "/usr/bin/X" immediately jumps to 80% cpu usage, and the Pale Moon instance itself jumps to approx 45% cpu usage. This is on my 2008 Intel Core2 Duo. Interesting note... when I switch to another tab, with onliner.by open in the background, both X and Pale Moon usage drop to normal. Hmmmmm.

yeah, almost the same experience and same CPU. It seems like users with i7 living happy without problems but not the core2duo. As far as palemoon is about optimization I see some issue here