So, by way of answering my own question, I found this map, which lets you work it out for yourself. Interesting stuff.
Which brings me to the question of how to benchmark now that I can make good guesses. Speedtest to US and Europe?
ETA: For those that follow, what I did was spin up multiple gluetun instances, Singapore, Hong Kong, Japan, hook them to firefox with FoxyProxy (different ports, duh) and compare speeds on https://librespeed.org/. Bottom line was the bottleneck was my ISP (surprise!!)
Still, I suspect there are ways to leverage crap internet to useful torrenting.
As it should be, don't do that.
Doctor, when I do this it hurts...
Also, you're creating a disk image...