1. When the author said in 8.3 that "the reader is warned that discussion that follows is fairly technical", I knew I was in trouble. I understood until that padding portion of the SHA-1. I didn't get much after that. With the DSA, I didn't quite understand the verification process and the explanation why it works.
2. It is interesting that both sections we read, that speed was mentioned. The DSA removes one step of modular exponentiation from the ElGamal scheme so it is faster. How much faster are we talking about: milliseconds, seconds, minutes? I am sure it depends on the size of message, so what is the Big-O of it is probably the better question to ask.
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