Spring loaded folder settings missing in Yosemite

Solution 1:

It appears that these settings have been removed from the Finder preferences window.

The slider is now located in System Preferences → Accessibility → Mouse & Trackpad
You can change the spring-loaded delay by writing the setting manually:
```
defaults write -g com.apple.springing.delay -float 1.0 && killall -HUP Finder
```
Replace 1.0 with the delay in seconds before springing.