Should I use Parallel Processing on an ASP.NET website? With parallel processing I mean for example Parallel.For(); or list.AsParallel(). I think this is all from the Task Parallel Library (TPL).

On my website there will be background processes that uses the CPU a lot and it can reach 100% usage. I use parallel to make the processes faster. But I read that it would be bad for websites because it make other web requests slower.

Is it better to use async or parallel? Or is there another way to run high cpu intense processes on an ASP.NET website?