Most of my projects render at realtime or faster.However, I do have a couple that render very, very slowly. Like 3 to 5 frames per second.
I still have not figured out what makes those projects render at a drastically slower rate, since they seem to be similar to other projects in terms of set, number of assets, and animation complexity. They preview fine, they just render slowly for some mysterious reason.
But as I said, MOST of my projects render quickly. Do all of your projects render slowly?