Have you tried resetting (completely deleting) your Dolphin settings?
Also, the CPU usage is not always relevant. If previous versions needed x% of CPU time to do something and new versions only need half of that, it doesn't mean new versions are slower or anything. In fact, 5.0 is much, much faster /and/ accurate than 3.5.
Also, the CPU usage is not always relevant. If previous versions needed x% of CPU time to do something and new versions only need half of that, it doesn't mean new versions are slower or anything. In fact, 5.0 is much, much faster /and/ accurate than 3.5.