Peer-Review

bare1:

1. Looks correct.
2. Looks good, except last question which is missing.
3. Check.
4. Check.
5. Check.

bare2:

1. Interesting that you got such a different speed-up than me, what could cause that?
2. Missing
3. What are the uncommented lines doing?

bare3:

1. Same here, big difference in speed-up, really scratching my head on this one. But good answer in last part, gave me some clarity.
2. Good answer.
3. Missing.

bare4:

1. Missing.
2. Well answered.
3. Here we are in agreement.
4. Really good answer, made it more clear to me.
5. Check.

bare5:

1. Good answers here as well.
2. Code looks good.

I guess you haven't gotten to the missing parts just yet, but if you have and you're stuck, ask for help and I can try give you some pointers.