I have found a performance problem when I started focusing on the machine Kotarak, follow the workthrough people leave in the machine page, I used burpsuit to run intruder attack on its internal ports which have 65535 ports. the speed is so bad, it comes with about 6.6 port/sec, in order to complete this scan I need more than 6 days!! After that i checked the settings of that scan I found with the community version the thread setting by default is set as 1 and cannot be modified.
So any alternatives like burpsuit can do the job with multi-threads.
Thank you in advance!