I have noticed that Particle Emitters seem to always start emitting at whatever frame you start to view the animation at.

For example, I added a particle emitter (Rain) to a project. The emitter starts emitting at Frame 0. However, as with all emitters, it takes it a few frames to get fully going and I just want frames when it is fully going. As such I rendered only frames after with the particle emitter was fully going in the preview. Much to my surprise, when I looked at the rendered video, it showed the particle emitters startup sequence (as if the particle emitter started emitting at my start frame).

Is this intentional or a bug? Or am I doing something wrong? Should I, for example, be turning the Bake Animation option on to bake the particle animation and then render it from a future frame?  

"We often compare ourselves to the U.S. and often they come out the best, but they only have the right to bear arms while we have the right to bare breasts"
Bowser and Blue, Busting The Breast