Need for Speed Shift becomes slow after reaching Tier 3

The brake dead zone and brake sensitivity change how does the game react to press the break pedal or a button on your joystick. It will not change the way the game react to your keyboard steereing. To get rid of the annoying assist, is to turn it off, or reduce it to minimum. I am not sure, but probably there is a config file that defines the distance to the curve to break, and the speed.

Clearly, one or more of your scripts have memory leaks. Worse, it's highly likely that their mutual interaction is making things worse rather than better (so it's also effectively impossible for us to say "yes, this is the bad one").

First, I would ensure that you have the very latest patch. That has fixed many stability issues: I haven't had memory issues in the unmodded game for months.

If that doesn't fix things, you're going to have to work up from a clean install and test each mod.

If you're already thinking of getting rid of a mod, I wouldn't bother testing it:

[SCRIPT] X3TC Cheat Package - Only until i get back most of the stuff i had in a previous saved game. I started a new game to get the map fixes. I think i was pre 2.5 before. I hope this mod is causing the issue as i don't plan to use it much longer.

Not to be mean but I would also suggest removing any of your own mods. I always start by assuming that new bugs in software were caused by me.