This bug all new AMD cards:
- Radeon HD 7XXX;
- Radeon R5, R7, R9 series;
- Radeon RX 400, RX 500 series
with Radeon Driver - from Catalyst v15.7 to Radeon Crimson v18.6.1 (all versions)
 
NVidia and Intel card there are no problems. Unfortunately, the problem low 2D performance is present on AMD cards only.
 
 
AMD keeps silent and hiding this bug.  
Forum - https://community.amd.com/thread/227931
 
Video demonstration of this problem:
1) Appeal to all technical specialists about Radeon bug
https://www.youtube.com/watch?v=AzaPmER2CoE
http://ge.tt/9NnRM6q2
 
2) 2D Test - 2D performance of aero and classic theme (bandicam)
https://www.youtube.com/watch?v=RSKAKjnuPJE
http://ge.tt/4PfMw5q2
 
3) Demonstration of poor 2D performance on real programs.
Slow scaling of the drawing in P-CAD and lags of the spectrum foobar2000.
https://www.youtube.com/watch?v=cggiDWjQuvQ
http://ge.tt/4xXdw5q2
 
4) Uninstall RADEON driver - increased performance in 2D GDI.
This is not a joke - it works so badly AMD driver.
Rendering time with Radeon driver is 140 ms and without driver 20 ms.
Software rendering of Windows faster, than "hardware" acceleration from AMD.
https://www.youtube.com/watch?v=j4VmpSRPEUc
http://ge.tt/8UaRx5q2
 
5) 2D Test - 2D performance of aero and classic theme (camera)
https://www.youtube.com/watch?v=kdTo-c0CAz0
 
6) Compare AMD graphics cards. The old video card is faster! Experiment 1
Old card PowerColor HD4670 (2009)+ Catalyst v13.9
https://www.youtube.com/watch?v=x25OLQtOqZs
http://ge.tt/7k4l1qp2
 
7) Compare AMD graphics cards. The old video card is faster! Experiment 2
New card ASUS Radeon R7 360 2G (2016) + Crimson v18.4.1
https://www.youtube.com/watch?v=uPjP7GwY6TY
http://ge.tt/7gEc3qp2
 
8) The performance of the GPU is enough! The problem is the low reading speed from the Video memory.
On the Display is lags! But on the Bandicam video is not lags!
From Camera:
https://www.youtube.com/watch?v=XpJhC8N9g0Y
From Bandicam:
https://www.youtube.com/watch?v=rbPjna3myew
 
There are other demonstrations:
- Demonstration from another user on the Radeon R9 380. The bugs are exactly the same!
- Demonstration of the absence of problems Radeon R7 360 under the system Windows XP
- A video of the "denial" of the bug, shot by an AMD employee. Video - fake !!!
The video is made on the patched Windows 8 system, under the Windows 7 interface.
After the exposure, the fake video was deleted, but I saved it.

Ok and what is your question ?  
Also, why posting this in English on a French forum ?

Demonstration from another user on the Radeon R9 380. The bugs are exactly the same!
Video 1:
https://www.youtube.com/watch?v=Lr24Z2Hnync
http://ge.tt/7VX7PIq2
 
Video 2:
https://www.youtube.com/watch?v=FRGCD2oaK_g
http://ge.tt/36r8PIq2
 
Compare 2D GDI performance - Discrette vs Integrated.
Test #1: Discrette graphic card - Radeon R7 360. Very low performance
https://www.youtube.com/watch?v=N8joTIfONzk
http://ge.tt/7mJu3Dq2
 
Test #2: Integrated CPU Intel i5-6500 - HD 530. Normal performance
https://www.youtube.com/watch?v=dnpOmyv83eI
http://ge.tt/6wDa5Dq2
 
Resume: Integrated CPU i5-6500 HD530 has higher 2D performance than the discrette Radeon R7 360.

ruslbug2d is a f*cking SPAMMER. And, probably a BOT too.

To everyone, don't click on these links, certainly malicious ones.

(en français, ne faites pas l'idiotie de cliquer sur ces liens au mieux suspects, certainement malveillants))

serait peut être temps de faire intervenir un agent de la brigade TT, non ?

Yep, déjà signalé le premeir post.

Edit > Le type (ruslbug2d) s'est inscrit le 19/06/2018, n'a posté que deux messages en anglais en tout et pour tout et s'est barré.