The issue was originally noticed between 4.15.1 and 4.16 Preview, but now appears to have regressed between 4.15.1 and 4.15.2.

Steps to Reproduce
  1. Open attached project in UE4Editor
  2. Enable Stat GPU

Results: ShadowProjection and HZB stats have increased by almost 200%

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ComponentUE - Rendering
Affects Versions4.15.24.16
Target Fix4.15.3
Fix Commit3449939
Release Commit3435138
CreatedMay 19, 2017
ResolvedMay 19, 2017
UpdatedJun 20, 2017