trackerd is niced +19 so cpu will nose dive to 1% if another app uses
cpu. Indexing needs lots of cpu which no indexer can escape from.
Switching to another will not change this (unless you consider slowing
indexing to such a crawl that it takes days to index which you can do
already in tracker-prefs by setting the throttle slider)

Only slow downs Im aware of is during index merging and these are 100%
due to I/O issues

during index merging I/O can become overloaded which can starve other
processes of disk due to bugs in kernel (lots of small writes kills
performance on ext3 but hoepfully ext4 will have pre allocation to
alleviate this)

In any event, next version of tracker (due this week) now pauses
automatically during merges whenever  the user moves the mouse or
presses a key/button so there should not be any perceptible slow downs.
tracker will be the only indexer AFAIK that has this feature and in
addition to other tweaks will have very low impact on system (except
when its idle of course).

-- 
Tracker should not be enabled by default until it doesn't clobber everything
https://bugs.launchpad.net/bugs/132741
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