Efficient usage of a fat but high latency link with the implementation of TCP to increase performance is achievable.
With Showerhead, you can run as many connections as you need, up to at least 20 (tested by netcatting large files). The number of streams used is configurable, allowing you to optimize the proxy for your particular connection.
While I haven't personally tested Showerhead on a high-latency connection with a large bandwidth, the tool has worked seamlessly for me in other situations. That being said, I do wish the Showerhead project was better documented and more user-friendly, as it is a useful tool for those dealing with similar networking issues.
Version 195: N/A