connections tracking speed max. 15Mbit

RouterOS Beginner Basics
1

Hello,
i have a RB450 with active connection-Tracking.
I have 32Mbit at the beginning and the RB450 stop it by 15Mbit.
What can i do that i have the connection-tracking and the full speed at the end?

Edit:
Wenn i disable the connection-tracking then i have 32Mbit but i need the connection-tracking.

2

Have no one an idea?
Have a 450G a higher connectens tracking speed or which configuration can i edit that i have full speed and the connection tracking?