Is it true that async should not be used for high-CPU tasks?

Question

I was wondering whether it\'s true that async-await should not be used for \"high-CPU\" tasks. I saw this claimed in a presentation.

So I guess

Answer 1

Unless CalculateMillionthPrimeNumberAsync constantly uses async/await by itself, there is no reason not to let the Task to run heavy CPU work, since it just delegates your method onto ThreadPool's thread.

What a ThreadPool thread is and how does it differ from a regular thread is written here.

In short, it just takes the threadpool thread into custody for quite a time (and the number of threadpool threads is limited), so, unless you are taking too many them, there is nothing to worry about.