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Thanks! No, I haven't. I think the differences should be negligible unless steem-js is doing something really weird :)

That was my thought as well - but this is still a great boost in performance for transactions that require signing. Are you using anything non-standard? Is this most likely a difference in use of different libraries?

I haven't profiled it but my guess is that a large part of the performance improvement is coming from the node-secp256k1 package. The browserify crypto implementations are really good as well.