I did more precise tests with beta 18 and found the exact point where DUDE craches and CPU overload begins.
A) I add 5 devices, 2 AP-1000 access point, 1 smnp managed switch, 1 Canopy AP and 1 Canopy SM.
B) At this point Dude works very well for 2 days and many remote access.
C) The exact point when problem begins is when I try to add a Mikrotik or Windows Server. I click <add device>, then type the IP address; when I click <next> the CPU overload begins immediatly.
I repeat this for 5 times, at each time I tried 3 different Mikrotik router and 2 diferent Windows Server in 2 diferent networks (not same IP range).
I hope that such information be helpfull.