I had a response from MikroTik earlier saying: "Next beta will have further improvements."I have done several tests with GNS3 using CHR 6.44.2 (stable) and as long as the router has enough memory, it doesn't crash. In my tests, the attack 'steals' around 180 MiB.
Using a CHR with 256 MB, system resources shows a total memory of 224 MiB and free-memory of 197 MiB before attack. During the attack, only from one computer, the free memory decreases to around 20 MiB and sometimes to 13 MiB. Using two attackers, it seems the results are the same and not worst.
With 200 MB the router reboots because OOM.
Fingers crossed, everyone…