How is Semantic MediaWikis performance?
There have been various tests done already to determine SMW’s performance, in addition to fairly large-scale real SMW installations. Unfortunately, none of the findings of any of these tests have been published yet. However, we do know some of the conclusions: SMW has been used successfully even with millions of rows of data; and the limiting factor is usually overly-complex queries. Caching tools like APC and memcached have been shown to have a helpful effect on SMW performance as well.
