Have you tried downloading large non-GFW files from China? You want to spend 6 hours updating xcode each time with a 1 in 3 chance of errors and failures?
Ir happens often when downloading electron from github while in Japan. Quite often I'll 'npm install' and then it's a 2hour download for what should be 20 seconds. All other western sites are working fine, just github's large binary files. Verified from multiple machines on multiple different networks around the city. Have reported the issue multiple times to github and they always claim "nothing we can do, not our problem"
