How many times have you heard that Lightroom is a great tool except that its RAW rendering is glacially slow, and it takes a long time to import files only to go through the culling process and end up discarding the ones you don't like and that didn't work out.  For the last few years, I have been using Photo Mechanic to do the fast view and cull process.  I'm hardly getting the full benefit of that amazing software but it does this particular job with speed and power.  Not everyone is willing to pay the price for Photo Mechanic though and I am asked very frequently for an alternative.  I couldn't recommend one until now.