Index Merging UI text not clear

Binary package hint: tracker

Dear ones,

This is about the attached screenshot. It is taken in the Performance tab.

The text doesn't make it clear whether the performance may increase or decrease when enabled.

Many blessings,
Shahar

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: tracker-search-tool 0.6.95-1ubuntu6
ProcVersionSignature: Ubuntu 2.6.32-24.42-generic 2.6.32.15+drm33.5
Uname: Linux 2.6.32-24-generic x86_64
Architecture: amd64
Date: Mon Sep 6 01:56:29 2010
EcryptfsInUse: Yes
InstallationMedia: Ubuntu 10.04.1 LTS "Lucid Lynx" - Release amd64 (20100816.1)
ProcEnviron:
 LANG=en_US.utf8
 SHELL=/bin/bash
SourcePackage: tracker