Simulation running slow

When I press alt + a the simulation starts but the problem is that I don’t know why it’s soo slooow (you can see 1 fps) and there is no animated objects.

Even when the screen is empty it is still slow.
And I only have song in it.

When you say simulation - do you mean animation playback - or are you animating smoke, fabric, particles, soled objects bouncing off each other, or something else simulation based?

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I mean animation playback. And it’s ok, I had 500 000 polygons so that was the problem. Lowered it now and it’s alright.