Most of the links to non-Apple downloads of XCode from https://www.baidu.com/s?wd=xcode%206.4%20%E4%B8%8B%E8%BD%BD seem to have been taken down.

If anyone else is interested, the SHA256 of XCode_6.4.dmg is fc25d75f23d82084dd740d7e29d0e5adea96dd600d1e19bc86408c133d1edf66 but you should verify that yourself as Apple don't seem to publish it (!).

This is one of those cases where a torrent + webseed would absolutely shine. Many torrent clients will try to prioritise peers that are closer geographically to speed up downloads.