Subnet scan running slow

Problem

Customer advises that the a subnet scan is running slow.

Environment:
iQSonar CR1
Windows 2008 server, with SQL 2012 Standard Edition SP3


Expected Behaviour:
Customer expects the the application to be faster when scanning subnets
Actual Behaviour:
The customer started with 8 subnets including /20 (where it locating 5000+ targets) /24 subnets.

Repro:
 Setup up a subnet scan


Solution

f you can go to administration tab you can change Max Active Jobs.
No usable issue stored in the context, unable to resolve filename 


Also please check isn’t something different that 0 .