For all its worth read what the Booth Ad com says about application submission.
Myth 6: The earlier you submit your application before the deadline, the earlier your interview invitation will come.
The interview invitation process lasts a few weeks for each round as our staff and graduate assistants read and review thousands of applications. The process of inviting applicants to interview is entirely random, and the point at which you hear from us is not a reflection on the strength of your application or the timeframe in which you submitted it – we promise! And we really do extend interview invitations all the way up until 9:00 am on the mid-decision date!
Yes, this is a myth for many applicants. Just believe admissions officers when they tell you that the application review process is not a linear one!