About the speedruns sites in my previous post:
some of them take a lot of space in the computer. Example, a Zelda OoT in 5 hours takes 1,2 Gb in normal quality (on the first link in my post). There are segmented runs, divided in parts, so in those you could watch boss fights only if you want. One of the runs has 106 segments and you must download them all separatly to see the entire run. Now just to show how some runs are great:
SMB1 in 0:05:05
Zelda OoT in 4:57:xx
SM 64 120 stars 0 deaths in 2:09:42
The test run of the SM 64 TAS was done in 2:10:xx
All three are single-segment, meaning they did it in one sitting, so if they screw up at the end they have to restart.
After seeing the SM 64 run (SM 64 is great), I tried to go as fast as the guy. It took me 30 minutes and 10 lives to get a star he got in 60 seconds