High CPU and memory usage when use Flash Player and images-heavy sites in all browsers or when I download files

Hello! From long ago I have issues with high CPU and memory usage when use Flash Player and images-heavy sites or when I download files. The issues happen in Mozilla, Opera, Opera Beta and Chrome. Also when I use fractals rendering software. CPU usage becomes as high that my PC start sounding like a helicopter. Here are some sites I cannot use for that reason (digital design related):

https://www.sumopaint.com/home/#app

http://weavesilk.com/

And this TV site:

http://www.hotstar.com/tv/diya-aur-baati-hum/81/episodes/81/9993

Even if I chose an interactive theme/appearance in Opera Beta (like Star Wars) CPU usage goes wild because Flash Player .

I asked some buddies and they don't have such issues with Sumo and Silk. I checked my anti-vir and it doesn't block anything Adobe or image related. My firewall doesn't block anything too. I posted my question in Adobe Community too (because Flash Player) but still got no reply.

My graphic driver is up to date. Pagefile size is also ok, set min and max to 1.5x of the RAM.

My Hardware and Environment details:

Windows 8.1 (upgraded from Windows 8)

RAM: 4 GB (3.88 Usable)

Intel Celeron CPU G540 2.50 GHz

64-bit OS, x64-based processor

I can't attach my DxDiag.txt file and I'm not sure if it is safe to paste it's content here due to publicly of my post.