2.5 beta 1

[Carlo]

Originally Posted by Rymek

using 2.5b1. Horrible performance and graphical corruption (same as with 2.4). Using external monitor with usb to hdmi dongle by unitek in general slows down whole system graphic performance wise. Attached 2 screenshots with examples of corruption.

And to give better understandin of what's happening when I plug in external display - without it whole system seems to be running at 60fps more or less, when plugging in the external everything slows down to 10fps (desktop switching, app switching etc.)

I'm not sure if switching to dell D3100 would be better option. It seems that it can handle 4k + 2xFullHD displays but i don't want to get stuck with expensive docking station and same issues....

Using El Capitan GM Beta and Macbook Pro 13" early 2015

Hi Rymek,

This kind of corruption usually happens when an application is trying to use hardware accelerated content on a virtual screen or when there is an issue with the software renderer for 3D content.

OS X does not support hardware acceleration on virtual displays so applications have to query display capabilities for each display and render accordingly.
The same applies to any USB or wifi screen with the exception of AirPlay that uses a proprietary interface.

Unless the public OS interfaces change I'm afraid we cannot do anything for this kind of problems. However application developers can ensure correct rendering if they are aware of these issues, I'd suggest to contact them.

About performance I think we can definitely improve the frame rate on our screens but any other slowdowns are again a systemic issue due to the fact that some screens are accelerated and others not.
You are welcome to join us in requesting better support for virtual screens from Apple!

Best regards,
Carlo