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Auto-Depth Causing Viewport Lag
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Description

System Information
Operating system: Windows-10-10.0.18362 64 Bits
Graphics card: GeForce GTX 1080/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 436.15

Blender Version
Broken: version: 2.80 (sub 75), branch: master, commit date: 2019-07-29 14:47, hash: rBf6cb5f54494e
Worked: (optional)

Short description of error
Enabling "Auto-Depth" in Navigation appears to cause 0.5-second delay to all navigation commands (pan, dolly, rotate) in Lookdev, and minor framerate stutters in other viewport modes.
Rendered appears to act similarly to Lookdev, however this is most noticable in Lookdev.
Tried multiple fresh installs, always occurs.

Exact steps for others to reproduce the error
Load default Blender scene
In Preferences, set Auto-Depth on
Switch into Lookdev mode. There will be perceptible delay when clicking MMB to navigate.
Barely perceptible slowdown/stuttering in Rendered and Solid viewmodes.
Seems to increase in severity with complex scenes.

Details

Type
Bug

Event Timeline

IMHO, it's bug or not...
Blender 2.81 (sub 4) 2019-08-31 17:53 rB883706395ee3
Same performance issue with Auto Depth (Preferences -> Navigate) & Look Dev mode enable

Demo:

Note: Viewport Gizmos are not effected