HN effect, search should be < 500msec normally. It is indeed semantic (POS tagger & chunker), but as mentioned atm this only tries to build Yahoo BOSS queries, which can't OR and rank, thus the bit lame results.
As I said, i think it's a good idea. I just think you should do some due diligence when using buzz words like "ridiculously fast" or "semantic search". A lot of people are allergic to buzzwords
After meandering through the Euro SemWeb ecosystem in 2005 i took the idiosyncratic liberty to include everything that uses semantics (eg POS) in that bracket. But definitely get the point, ridiculously was the next choice after "here's your weekly writer app".