XsTrimmerLite is lighter, more stable and has a better trimming engine than XsTrimmer.
Apple makes its switch to the Intel platform. Extra code is generated in the executable files that is not needed. XsTrimmer identifies the code which is not used and removes it safely. This normally eliminates half of the code in an executable.
There are also multiples language files in an application that is not used. XsTrimmer also eliminates this safely. This also shrinks the application size tremendously.