Anyone here use the Firebird database? The only benchmarks I have found so far seem to indicate that Postgresql is roughly 20% slower than Oracle (this is obviously a few app-specific thing, but I'm looking for rough numbers). I'm curious how Firebird compares to the others?

I haven't seen any formal benchmarks for Firebird either. But, this site has a chart that gives somewhat of an idea, for what it's worth.