I have found that even over our corporate/S2S direct transfers between Chengdu & San Fran are much slower than transferring via AWS. AWS has an enormous latency and bandwidth advantage, but it costs money.
If you’re looking for a free option, while I’ve not tried it, I know gmail seems fast for me and has massive e-mail storage (well, for the file size you’re talking about, anyways :D) but there are often timeout/instability issues with any sort of web upload/download for large files, still may be worth giving it a shot. Any small-time or unpaid service will always be slow, just how it is with bandwidth allocation and efficiency in routing.