"Fast render preview" is a blender addon that helps you render a fast and simple render of your scene, without tweaking all the settings every time you want to render a preview.
All you need to do is press "Alt" + "F12" and will get your render preview!

With the help of this Addon, you can render a quick and small version of your work, so you can see if your work is in the right direction.

Until now to do this, I had to change all the appropriate settings, such as the number of samples, the resolution, and more to get a simple version of the render, and then after the render finishes, I had to return all the settings back in order to get the next image out in good quality, not a small headache especially when you want to render a lot and images to check how it comes out in the preview, so with the help of this add-on, you just press one button, and it is already set by itself the settings that will fit the simple image, and when it finishes rendering, its returns the settings of the rendering to what it was before a perfect solution!