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For really small four-pots and three-pots I've had and tested, it seems to be about a 10-15% penalty in traffic, depending on how weak the engine was and how big the compressor was.
We did this on the dyno (a hell of a long time ago) and got about a 10-15 horsepower drop on a standard 1.6 liter engine at idle... which just happened to have 400 horsepower and a turbocharger, but it's the same for most small engines... and the turbo didn't make boost at idle.
Worst I had was a compressor conversion when the Calsonic compressor clutch on my Nissan went kaput for the fourth time. Stuck a bigger compressor with an indestructible rubber clutch on it, instead... on there and you could feel about 25 to 30 ponies go south every time it turned on.
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