You couldn't have been closer to what I was thinking. Spot on.

I'm also surprised. Every java-program I've run on both windows and Linux was slower on Linux. For instance I made a program which fetched the contents of the clipboard. On windows it took 33ms, and on Linux about 800ms.

I also discovered a lot of inconsistencies in "cross-platform" java. When I push and hold down a button in windows it's received as Down - pause - down down down... And on Linux it was for some reason Down Up Down Up...

I suggest iperf.

iperf -s on the server side
iperf -c <server ip> on the client side.

But does it make self-signed HTTPS worse than plain HTTP? HTTP is the most insecure and easiest to attack. Why should it be harder to use the more secure one?

The only thing that's worse is that they might feel secure when they're not. But that don't justify making it harder to visit HTTPS-sites. Just notify the user in a sane way.