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My "mac build machine" is running XCode 8.1.0, and I noticed that the binaries built (with the same flags) on my MBP with XCode 11.2 (and also 9.1) are much slower for a specific app. Like 10x slower.Again: the same exact sources, the same exact compiler flags. But the version built on my MBP w/ XCode 11 is signifcantly slower than the version built on my Mac Mini w/ XCode 8.The **** is, I can't install 8.1 on my MBP, because apparently it won't run on Mojave. And I can't install even 9.1 on the dev machine, since it's running Sierra.What I wanted to try was 8.1 on my MBP, to see if the actual problem is the compilers; but I can't figure out how to make that work.I'd be most grateful for some way to determine what the actual problem is. I did notice that on running jtool2 -L against both binaries (on my MBP), I get the curious result that they link different actual code at runtime: /System/Library/Frameworks/AppKit.framework/Versions/C/AppKit (compatibility version 45.0.0, current version 1504.82.104) (compatibility version 45.0.0, current version 1671.60.109)/System/Library/Frameworks/ApplicationServices.framework/Versions/A/ApplicationServices (compatibility version 1.0.0, current version 48.0.0) (compatibility version 1.0.0, current version 50.1.0)/System/Library/Frameworks/Carbon.framework/Versions/A/Carbon (compatibility version 2.0.0, current version 157.0.0) (compatibility version 2.0.0, current version 158.0.0)/System/Library/Frameworks/Cocoa.framework/Versions/A/Cocoa (compatibility version 1.0.0, current version 22.0.0) (compatibility version 1.0.0, current version 23.0.0)/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation (compatibility version 150.0.0, current version 1349.65.0) (compatibility version 150.0.0, current version 1575.23.0)/System/Library/Frameworks/CoreLocation.framework/Versions/A/CoreLocation (compatibility version 1.0.0, current version 2101.0.62) (compatibility version 1.0.0, current version 2245.16.14)/System/Library/Frameworks/CoreServices.framework/Versions/A/CoreServices (compatibility version 1.0.0, current version 775.19.0) (compatibility version 1.0.0, current version 946.0.0)/System/Library/Frameworks/Foundation.framework/Versions/C/Foundation (compatibility version 300.0.0, current version 1349.64.0) (compatibility version 300.0.0, current version 1575.23.0)/System/Library/Frameworks/Security.framework/Versions/A/Security (compatibility version 1.0.0, current version 57740.51.3) (compatibility version 1.0.0, current version 58286.255.3)/System/Library/Frameworks/WebKit.framework/Versions/A/WebKit (compatibility version 1.0.0, current version 603.1.30) (compatibility version 1.0.0, current version 607.3.9)/usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 1238.51.1) (compatibility version 1.0.0, current version 1252.250.1)/usr/lib/libc++.1.dylib (compatibility version 1.0.0, current version 307.5.0) (compatibility version 1.0.0, current version 400.9.4)/usr/lib/libcups.2.dylib (compatibility version 2.0.0, current version 2.12.0) (compatibility version 2.0.0, current version 2.13.0)