The wire deserialization optimization is running. performance is definitely improved. This bypasses the linear memory allocator for block construction so that becomes dead code. I'll remove that from the block constructors and related code, which will be simplifying. Still haven't had a chance to complete performance testing on low memory, those numbers should be available in the next couple days. But on the maxi the first 500k blocks in a milestone run (1/4 of the 900k chain) complete at about 70% of the best previous times up to that point.