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In recent adb versions, the push command supports a new option --sync which performs checksumming of the files to transmit against the files already in the device. This increases the effective transmission speed of the inital step in the test for Android. It should not affect the speed of each tests, since they are pushed to different folders, and also they are removed when they are successful. However, the test executables are small compared to the size of the libraries from the stadard library and dependencies. This should exclusively affect Android and only to people testing the executable tests (not CI).