Comment # 23 on bug 1089116 from Bit Juggler

(In reply to Stefan Dirsch from comment #22)
> Honestly I meanwhile doubt, that Bumblebee works for anyone on Leap
> 15/TW.Why is this considered P0/Critical? It's even a manual process to
> configure it at all.

Well, when i look here (https://news.opensuse.org/) i can read

"Based on enterprise code tested millions of times opensuse leap 15 released"

and

"openSUSE Leap 15 now allows migration to SLE, brings a new partitioner,
integrates the Groupware Kopano, moves to Firewalld ��� and also comes
distributed by Linode (for Cloud and infrastructure setups) and on high-end
hardware like Tuxedo Laptops (other Cloud and hardware vendors will follow)."

When i happen to have such a piece of "high-end hardware like Tuxedo Laptops"
and i experience that an average user will not be able to install/use openSUSE
Leap 15.0 on on it, then i think this is "Critical" and should be resolved as
soon as possible. But may be i'm too much of a sales person.

However i found a way out:

After installing "xf86-video-intel" from the OSS repository the system starts
up in graphic mode.

Playing with the KDE compositor options i found that switching the rendering
backend from "OpenGL 2.0" to "XRender" will remove the sluggish behavior of the
the GUI.

In openSUSE Leap 42.3 there was no need to install "xf86-video-intel" or to
switch the KDE compositor backend to "XRender". Nor does any of the openSUSE
docs (Release notes, SDB:Articles, ...) mention any of this.

So i don't know whether i just found a workaround for a bug or whether that's
the way it is intended to be.

However for me it works so i consider this problem as solved.

Thanks to everybody who helped me to solve this.