> <@kolonka:matrix.org> what do you mean by 'several GB in flight' ˈt͡sɛːzaɐ̯
> also yeah pinning on earth would help

Typically, when transferring data, you make a bit into a light-wave (well, symbols actually), then you make the next bit, then the next, …
By the time the first bit's lightwave arrives on a different planet, you'll already have made several 10 billion bits into lightwaves, if you want to transfer more than a few MBit/s.