Dolphin is a dual core application that relies upon IPC (Instructions Per Clock) for performance.Additional cores will not make Dolphin go any faster, though an "extra" core that Dolphin isn’t using may help slightly by keeping background tasks from using the same cores as Dolphin.Laptops and modern GPUs use a variety of tricks to reduce their power consumption and overall temperature.Underclocking, reducing voltages, using integrated instead of discrete graphics, etc.The runtime has a minimum system requirement of Windows Vista SP2 and Windows 7 SP1.Also, remember to extract Dolphin's files from the archive to a folder on your computer instead of running Dolphin directly from inside the archive.
For their ease of use and additional graphics backend options, Windows is generally recommended for most users.
If you're suffering from this issue, make sure to delete any manually downloaded DLL files which are stored in your system paths and in the path where the Dolphin binary is stored and reinstall them with the proper runtime installers instead.
Refer to the two questions above for further information.
Note: For more information regarding CPU performance, please checkout this handy benchmark that contains results from tons of users.
Just remember that Dolphin is a console emulator: it does what the games instruct it to do. Some games run well on most modern processors, while others won’t run full speed at all times on even the most powerful of processors.
In an effort that eventually fixed 99% of the problems, audio emulation was revamped to be synchronous to emulation speed.