Error or technical problems
Computer errors (lag, crash, hang …) are common problems that often occur during rendering. There are many causes of this situation, including low RAM capacity, heat dissipation, power outages … Imagine that you have to learn to fix or even re-render from the beginning. This is really a nightmare for anyone.
Utilizing the resources of the machine
Rendering means you have to use all the resources of the machine. Instead of being able to do many things at the same time, now your machine only serves the rendering process. This has a lot of influence on progress and productivity.
What is the first thing you think of when it comes to rendering? Many people said that it was rendering time. When implementing a 3D project, rendering is one of the most time-consuming processes. On average, in order to render 1000 -1200 frames, you need at least 8 hours (take longer if there are some complex frames).
Because of taking a long time, rendering is considered as the most stressful and worrying process, especially when the deadline is approaching.