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Laggy display when subdiv modifier is active
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System Information
Operating system: Win7 Home Premium 64-bit, SP1
Graphics card: Nvidia GeForce GTX 750

Blender Version
Broken: 2.80, c97c76c01c1d, blender2.8, 2019-01-04
Worked: 2.79, 5bd8ac9, blender2.79, 2017-09-11

In both versions, CUDA is activated and GPU is used.
The lagging is seen both with Cycles and Eevee render engines.

Short description of error
As seen in the videos, creating a cylinder, applying a subdiv modifier, applying a loop cut & slide and moving it up and down:
Blender 2.79 --> smooth and fast display

Blender 2.80 --> laggy display

Exact steps for others to reproduce the error
See above