Attach the “DepthOfField” to “render camera”.
Then, it became very heavy.
In the case of other effects, the problem does not occur.
Is there a solution?
Please check the symptoms in the image.
Yes, Image Effects should be attached to the Render Camera just like you figured out.
There is currently a slow down when using Depth Of Field specifically. My bad. I will fix this issue in the next version as soon as possible.