Video Stutter In YouTube/Vimeo

Streaming video stutters/lags/skips on a fresh Kodi 17.3 installation, within YouTube and Vimeo, while using/selecting/typing in another application on a secondary monitor. CPU/disk/network usage is normal. Issue not present in version 16. Re-installation of version 16 solves this problem.

https://paste.ubuntu.com/24750507/