System Information
Operating system: macOS 10.14
Graphics card: Intel Iris Plus Graphics 640

Blender Version
Broken: 2.79b
(example: 2.79b release)
(example: 2.80, edbf15d3c044, blender2.8, 2018-11-28, as found on the splash screen)
Worked: (optional)

Short description of error

Exact steps for others to reproduce the error
Based on the default startup or an attached .blend file (as simple as possible).

every time I click Alt-A blender lags so much with like 0.1fps and it takes 5 secs for me to click any tools or options.