Is it any way to increase number of jobs in Atlas execute in parallel?
These settings control the threadpool:
<spring.batch.taskExecutor.corePoolSize>10</spring.batch.taskExecutor.corePoolSize>
<spring.batch.taskExecutor.maxPoolSize>20</spring.batch.taskExecutor.maxPoolSize>
You can increase those in your own settings.xml file when you build the WAR.
Details on how these paramaters work found here.
Thanks @Chris_Knoll