I have been seeing a few answerhub threads about very low performance on tessellation with landscape.

What is puzzling is that it does not seem to change performance whether low or high tessellation is used, or if distance based masking is used to reduce how much landscape is tessellated. Frame rate seems to plummet.

I think we really need to investigate how much work the tessellation shader does on terrain. It may be doing unnecessary work all the time.

Steps to Reproduce

A test level with some landscape tessellation is included in CL 3079376

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ComponentUE - LD & Modeling - Terrain - Landscape
Affects Versions4.
Target Fix4.13
Fix Commit3079376
Main Commit3092051
Release Commit3079389
CreatedApr 22, 2015
ResolvedAug 5, 2016
UpdatedApr 27, 2018