So you find perfectly normal to block the search to execute potentially several HTTP requests for each core/installed extensions displayed (and I'm not even talking about the time it will block if there is any lag in any of the repository supporting rating) ? And when the extension already come from a repository supporting rating it's useless since the extension already contains it.

If he absolutely want to add some rating discovery for core/installed extensions then he should make it asynchronous but the way it was done is a big -1 from me.