F50, I just wanted to have a look at the lagometer (which I already had on), and then I saw that the problem is gone! I thought about it and, also thinking about KillerWhale's reply, realized that I had been running µTorrent the whole week, but currently, it's off. Now, this might sound lame to you, but before you judge:
Why would my local camera movements be slowed down by a slow connection? I didn't have that problem with the TJW backport.
Also:
I just connected to Wonderland, which has a new provider located in Germany, where I am, too, so the ping is low. I played a minute, and realized that every move I make and every shot I take is delayed by the ping length. I connected to a server where I have 500 ping and tried... indeed, everything I did was delayed by half a second!
WTF? I didn't have that behavior in the TJW backport. Everything I did there, it immediately happened (on my screen only, I know), but everything I do in Tremfusion happens on my screen only after the server has given its ok, so to speak.
Is there a way to change this?