I take small jpeg + big raw.
I use 1 python script to divide the jpegs and raws into separate directories. (well, the raw directory is nested)
Then i use DPP to quickly go through the jpegs and delete the really obviously crap ones.
Then i use another script to "sync" the jpegs and raw files. Ie, delete the raws for which no jpeg exists.
Then kill all the jpegs.
Then use LR4 to import the raws and edit them.
Note: I found DPP's Quick preview blindingly fast when using jpegs. It sucks majorly when with raw files.
Then i use another script to copy the images from my "just in" folder to the destination folders wherefrom I will copy to my backup disks when I get around to it.
Here, have the scripts, in Python 3.x. For windows only. (I couldn't be bothered using OS independent commands but it's doable.
NB: Some very slight programming skill is required to use them. Ie, change the paths around to point to your directories. But it should be somewhat self evident. You also need to install python 3.x. That is, python 3 point something.