What component affects how long it takes to load in to a game?

[McGamer]

I mean the most. CPU/RAM/GRAPHICS/HARD DRIVE? All?

 

[mamasan2000]

Where do you install games? On your CPU/RAM/GRAPHICS CARD/HDD?
That is also the slowest component, by a long mile.

 

[ak47jar3d]

Usually it's the hard drive. A really slow HDD will really prolong load times while ssd will make it go by in a few seconds.

 

[herrwizo]

There are multiple components involved here. The biggest boost will be provided by using an SSD instead of mechanical HDD. However, performance of your CPU is also important, since there are many calculations involved here, not only pure loading. Also, you need to have enough RAM to allow everything to load smoothly without swapping to disk.