I did the following, since I'm a steam user:
1. Downloaded 2.5-2.6 patch from egosoft. Ran the exe, and installed into a new folder OTHER than the X3tc folder.
2. Copied the 2.6 exe from the new folder to the x3tc folder, make a backup of your existing exe just in case
3. Opened CFF explorer,opened the new copied exe in x3tc folder, and clicked "click here". Selected "this app can use more than 2 GB".
4. Saved.
5. Started X3tc, then opened ctrl+alt+del to bring up task manager, selected x3tc in processes. Set it to high.
End result:
Drastically better FPS in the "heavy" sectors, no lag or jittering of UI which happened all the time before.
(made this so it's uptodate if people had any questions)
EDIT: My 4 GB RAM is now seeing 90%, instead of the old 63%
