I installed and tested.
It made everything from the header down disappear.
We also only saw minimal improvement in speed according to googles speed test tool.
Minification in wordpress is extremely difficult, esp if you have several plugins. All you can really do is to install as few plugins as possible. Minification really cannot be used effectively with wordpress. We have been developing in wordpress for many years and know this to be absolutely true.
Hope this helps someone
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