what it does:

1. Reduces the timescale by twice of the original value. From 20 to 10.
This means that for each passing minute, the 10 minutes passes in the game world (originally 20).

Thanks to this you can do more activities per day. Really useful if you run the "realistic needs" mod. With an additional time you can for example put your character to sleep :)

If your day schedule kept you occupied for the entire 24 hours, It will now only be 12 hours. The next 12 hours can be used to let the Dragonborn rest, for sure he deserves it after adventuring all day long!

2. Lowers the cell respawns, from 30 to 15 days. To balance it to the real time.

3. Also includes the Fast travel timescale fix. The only difference is that we have the multiplier set to 2.

precaution:

Mod should be safe, not causing any problems with quests. To be on the safe side, delete the iPresentInterval line from both of your ini files ("Skyrim.ini" and "SkyrimPrefs.ini" inside the "C:\Users\UserName\Documents\My Games\skyrim") to enforce the usage of it's default value by the game engine. For more, follow the Skyrim Stability Guide.

ESP file is clean and mergeable.

complementary mods:
Immersive Movement Speed