Hey , thanks for entering the report. I was using the source version for all builds:
Windows DevelopmentEditor target built on Windows 10 using Visual Studio 2015 Update 3
Mac DevelopmentEditor target built on macOS 10.11.6 using XCode 7.3.1
Linux Development target built on Windows 10 using CrossToolchain_Linux/v7_clang-3.7.0_ld-2.24_glibc-2.12.2.zip
Btw why exactly does it differ if you package the same project in shipping mode using different builds of the engine (binary, source)? Shouldn’t they both have the same (or very similar) optimized output?