Is corespeechd burning your CPU? Read this. A couple of days ago I found my MBP was running fan all the time. Usually it is silent, but not any more. A quick check on Activity Monitor showed, it is a process called corespeechd — consuming something like 60% of the CPU. After a bit of research on Google, StackOverflow, Reddit & all other forums, below steps solved the problem. By the way, read more only if you are not using Siri on your Mac.