Slender: The Arrival

The same basic logic applies to this speedrun as the one for The Eight Pages (Speed Runner I). You will want to be familiar with the map, and definitely play on Easy. See the map below for a rough layout of the level (ignore the gas canisters, as those only appear in Hardcore difficulty):

For this speedrun, I suggest taking the leftmost route after you start the first generator in the center room (the first path directly left of the entrance on the map above). Methodically, check every room that has a chance at having a generator, and once you've activated all 5 (you can check your progress by pressing / ), make your way back to the elevator as quickly as possible.

Important to note for this speedrun is that if you die and "retry", it will count the time from your last attempt as well. If you fail a speedrun, you need to exit to the main menu and load the level up again. The time for the speedrun includes the beginning section of the level (outside) all the way to the end of the level at the top of the elevator. A lot of the pain to this speedrun is the random placement of the generators, and the fact that you don't just have Slenderman coming after you. You have have to try more than once to get an optimal layout.

Check the video below to see a successful speedrun: