Stop Rendering Same Frames
during an animation happens always that we have multiple same frames because nothing changes among those frames. blender can simply have an option to recognize it and just copy the last rendered image instead of creating one again. so the rule is simple, if no variable changes from the last frame, blender copy and paste the last rendered image.
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See thee addon "Loom", which allows you among other things to render only needed frames between unchanged keyframes.
There is an option called 'persistent data', which helps a bit, take a look in this page: docs.blender.org/manual/en/4.1/render/cycles/render_settings/performance.html
Unfortunately this option is sometimes causing issues/not working well though, when doing things like FLIP fluids at least.