It looks pretty clean up until you see all the command code that could be changed to something like entmake, but I don't think anything will really make it much faster. Milliseconds maybe, unless you're talking hundreds of object insertions. You do recall the code races we had in the early days of the swamp, I presume. Search them out. They're in vlisp hackers. Mark, Stig and myself were quite involved in testing different functions with the help of others.