I guess the point of posting it here is to gather folks with pitchforks and torches demanding immediate attention to the issue. For a few months V8 team has been working hard on improving the GC (http://code.google.com/p/v8/source/browse/branches/experimen...) which was the major limiting factor here. I don't have an ETA of when it's going to be merged, but the new GC branch is in a pretty good shape.