It is safe to install The Dude on RB751U-2Hnd?

Simple I just install the Dude (3.6) on a RB751U-2Hnd (Versions 5.14 and 5.12) and the cpu usage goes to 100%, rendering the router unstable…

Any comments?

I wouldn’t. Depending on network size it is very hard on your CPU and Disk space.

I forgot to mention that is NOT any device connected to the mikrotik jet

You will be better off to setup a machine for the dude. We have not had much luck installing the dude on any Routerboard besides the 1100 series and it was still intensive.