Operating system: mac OS Mojave v.10.14 MacBook Pro 15-inch 2015
Graphics card: AMD Radeon R9 M370X 2048 MB / Intel iris pro 1536 MB
Broken: (example: 2.80, edbf15d3c044, master, 2018-11-28, as found on the splash screen)
Short description of error
Strange lag happened today in render view.
Exact steps for others to reproduce the error
Based on the default startup or an attached .blend file (as simple as possible).
Moving camera in render view (viewport shading) causes repetitions to appear of object in scene. This didn't happen before in this file.