Hi Mathias,
For the uploading test, i guess you may reproduce it with a lib like google probuf. The key point is to uploading a large file to the build server. You can observer the detailed network traffic during uploading.
Indeed we also want to use the clang 6, but the build is failed.
The building error for the pragam pack might be introduced by a socket extension base on following lib.
include.zip (1.0 MB) . This is the only pice of code using pragma pack in our project. Maybe this compiler topic shall be continued in another post: https://forum.defold.com/t/a-building-error-in-release-version-1-2-133-with-clang-6/25286