Despite an onslaught of hype this month, Bing’s performance is ringing hollow. The new Microsoft search engine increased its share of the search market by just four-tenths of a percentage point, according to an unreleased survey by Web ratings firm ComScore Inc., rising to 8.4 percent from 8 percent in May.

Any expectation that the service was siphoning traffic from market leader Google (65 percent, unchanged from May), would appear to be unfounded. If anything, Bing sliced off a fraction of the traffic from second-place Yahoo, whose share dropped half a point to 19.6 percent.

The lack of any major uptick by Bing has been widely cited. In its numbers, Compete.com found that Bing helped Microsoft increase its market share by three-tenths of a percentage point, pegging it at 6.5 percent (still less than the 7.2 percent Microsoft had in June of 2008). And HitWise observed a slight drop in Microsoft’s market share in June.