Symptoms
Video Based Screen Sharing (VBSS) is a new feature of Skype for Business (SfB) 2016. As of May 2016, VBSS is only available in peer-to-peer SfB sharing sessions and is only utilized on the Present Desktop sharing option. When sharing full-screen, with 4k or Ultra High Definition (UHD) monitors, the CPU usage of lync.exe may be higher than expected. CPU usage may be high enough to impact the performance of other applications, or of the operating system itself on the sharing machine.
Cause
The VBSS feature on 4k/UHD monitors processes a large amount of data, which can cause high CPU usage on the sharing machine. The affect of this processing will be less noticeable on high-end processors.
Resolution
There are twp workarounds:
1. Disable the VBSS feature in the registry, and restart the client.
2. Do not share the desktop in full-screen mode.
More Information
Using either of these two registry settings can be used to disable this default behavior by setting the value to zero.
For the 64-bit Skype for Business application running on a 64-bit Windows operating system:
[HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Lync]
"EnableP2PScreenSharingOverVideo"=dword:00000000
For the 32-bit application installed on a 64-bit OS
[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Office\16.0\Lync]
"EnableP2PScreenSharingOverVideo"=dword:00000000
