Thanks for your replies :-)
@Ken Miller: I can try that when I have more time for that but before the kernel upgrade the performance has been already bad. This was the reason for installing the catalyst driver.
- The SMART values of my HDD (WD6400AAKS) are generally OK. There was only one reallocation event but this value has been constant for years now ;-)
- I have 103-109 MB/s but will make some more performance tests.
- Even the thinnest fins of my CPU heatsink are clean due to my dust filters.
OK, the drop down terminal is animated exceptional smooth, haha. The problem is e.g. when I type in a web address in the web browser I have to wait about 2 to 3 seconds till I can read the first letter
Perhaps I will install the system completely new. But for now I want solve this problem an learn something.
I cannot imagine that it will fix the problem because the USB live image does not use the catalyst driver and runs smooth. But in the end I do not know ;-)
Another problem I have is that the suspend and hibernate functionality is not working (the PC does not wake up) and the corresponding buttons in Gnome are missing. Perhaps it has something to do with the graphics driver?
OK, I will ask again when I (have) install(ed) the catalyst packages, thank you.
This was the way I installed the catalyst (from the unofficial repository) and yes it was tricky - for me.
I am not shure if the driver has been installed correctly. Then a kernel update forced me to go back to the open driver because the Xserver could not start anymore and I could not fix this problem.
I always thought the Antergos USB live image is using the open source driver.
Since I installed Antergos on my HDD the UI/UX and general performance is too slow or bad on my machine. For example the every button is very unresponsive, animations are stuttering, the reaction time during browsing is way too long and light tools (e.g. Terminal, Nautilus etc.) take a few seconds to start.
But when I start the Antergos live CD from a (slow) USB flash drive everything is so smooth and fast.
How can I get this normal performance on my stationary HDD installation?
The hardware: 12 GB DDR3, Phenom II X4 955, Radeon HD 5770 (with the xf86-video-ati driver)
The desktop: Gnome 3.18 (formerly 3.16)
Since I have nearly no experience with Antergos/Linux I do not know where to start to solve this issue.
Please let me know if you need more software or hardware details.
Thanks in advance