[FEATURE] Speed up file Index Analyser

Change-Id: I563c8d461ae278b6d5775261ad4ef216c6d26667
Release: 3.0
Resolves: #61103
Reviewed-on: http://review.typo3.org/32282
Reviewed-by: Fabien Udriot <fabien.udriot@ecodev.ch>
Tested-by: Fabien Udriot <fabien.udriot@ecodev.ch>