SSH started out with a maximum window size of 128K, which was bumped to 2M in the mid-2000s. It'd be entirely reasonable to bump this to the 64M to 128M range; it's not a fixed buffer allocated for each channel, and the peers explicitly manage the window size, so there really shouldn't be any compatibility issues. This would already solve most of these issues, the more complicated parts of HPN-SSH aren't really needed, and things like multithreaded crypto are entirely unnecessary with modern CPUs unless you need to saturate a 100G link with one connection.
> unless you need to saturate a 100G link with one connection
Maybe not 100gig, but I routinely transfer data over 10gig links. I used to be a heavy user of HPN, but Gentoo pretty much stopped supporting it because the multithreading is supposedly broken.
