The frame speed for about 1 second is 2-3 seconds?
There are several places in the process that you can be talking about.
1.) the workspace is slow
2.) it takes 2-3 seconds to RENDER about 1 second of animation
3.) after you have rendered your animation you play back the video that you just created and everything is slower than it should be.
If it's the wrokspace itself, or the render speed, there isn't much you can do about it other than getting a computer with more ram faster processor and faster graphics processing (better graphics card), or just settle for using less lights, and lower poly images. The more lights and polys as well as shadow effects that you are working with, the more it drains on your resources.
If the problem is that your rendered animation is actually slow, it's because you missinterprated how the program works exactly.
In your preferences, you set your frame rate. Let's say regular movie speed of 24 FPS... and then click in "limit playback".
if It's 24fps, that means that, frame by frame 24 1 second has lapsed, by frame 48 2 seconds have lapsed and so on and so forth.