Temporary Boosts

You can spend credits in the Misc section of the credit shop.

Here you can buy global Double, Haste or Double Haste for a certain period of time.
Double = 2x gold/xp or resources, UNLESS you are in a rift. When in a rift double will make your fights and gathering attempts 1.5 second faster.
Haste = make battles and gathering attempts 1.5 second faster. UNLESS you are in a rift. When in a rift Haste will make your fights and attempts 1.5 second faster
Double Haste = a combination of the above, UNLESS you are in a rift. In rifts Double Haste will make battles and gathering attempts 3 seconds faster.

Here you also have the option to reset your battle skills and gathering skills. Both cost 50 credits / reset.