Yelp's relevancy

Yelp collects and hosts reviews and ratings for all things local. Over years it has collected zillions of such records. Any one in the internet services industry understands that it is like a diamond mine. However, I see quite a few issues with their search. The site is relatively slow compared to many other sites. The local search relevancy is not as good as Google. Hence, it is often easier to find specific local places in yelp by first starting the search in Google. They recently made a few new features such as detection of interesting phrases etc. These NLP features are good but I believe they have only touched the surface of their potential.