Is it good to have slides that may be skipped during a presentation? 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?
Put the slides that contain the proofs after the last slide and have links on the relevant slides so you can jump to the proof slide and back to the next one.

That way no-one will know if you skip the proofs, but they could see you click the link to jump to a proof if you have the time.