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However even if the algorithm drops 5 to 10% of the description, think about the savings in bandwidth..
just 1 byte. 1 byte * 10 listings ( default ) * 100,000,000 searches a day. That's 1 billion bytes less a day that they need to transfer.
it allows for more searches, without needing to buy more equipment.
I also noticed this trend when they redesigned the serps last year...