Not really. When Dolphin runs slowly, it's due to the host computer (your computer) not having enough power to emulate things at full speed. So in that case, the hardware is at fault.
A slowdown caused by Dolphin would be something like memory leaks (Dolphin accidentally uses a bunch of RAM, and causes the entire system to slowdown). Another example would be improper coding that unnecessarily halts or stalls program execution (unoptimized code, or just a bug). But these kinds of slowdowns where Dolphin is to blame are very rare. Chances are, if Dolphin is running slowly, your hardware is too slow.
A slowdown caused by Dolphin would be something like memory leaks (Dolphin accidentally uses a bunch of RAM, and causes the entire system to slowdown). Another example would be improper coding that unnecessarily halts or stalls program execution (unoptimized code, or just a bug). But these kinds of slowdowns where Dolphin is to blame are very rare. Chances are, if Dolphin is running slowly, your hardware is too slow.