My R* trees in java run within 5x the speed of C++ versions, maybe 3x. I just use object pools and primitive data elements without "accessor" functions. If you

My R* trees in java run within 5x the speed of C++ versions, maybe 3x. I just use object pools and primitive data elements without "accessor" functions. If you write Java as if the garbage collector and malloc actually worked as advertised, you deserve to have your software run dog slow. Nobody has ever invented a garbage collector or memory defragmentor that works for the usual CRUD Java workloads and for data-heavy or scientific computing tasks.