sperber(a)informatik.uni-tuebingen.de (Michael Sperber [Mr. Preprocessor]) writes: Could you please state more exactly what you mean and how you conclude that from the test you posted. I'm guessing that you mean that "In an old XEmacs 21.2 everything is slower than in an fresh XEmacs 21.2. This slowdown was not present in previous versions." My profiling data looked sane and there the slow down looked mostly due to spending more time in GC. Jan P.S. We currently use 50% more memory per cons cell.