I am preparing a seminar talk. Currently the presentation contains some theorems and some proofs. Probably, I will not have time to explain all the proofs - I will have to skip some of them. My question is, which of the two options is better:
Keep the slides with the proofs visible, and during the presentation, if I see that the time is tight, rush through them saying that "I skip the proof", or -
Keep the slides with the proofs hidden, and during the presentation, if I see that there is enough time, unhide and go through them?
The advantage of option 1 is that the audience sees that I have a proof and they can read it later if they want; also, if I have time it is easier to present the proof; the disadvantage is that it might look confusing or unprofessional to rush through slides. Are there other considerations?