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c# - Newly created threads using Task.Factory.StartNew starts very slowly

In an WPF/c# application that uses around 50-200 of short living worker-threads created by Task.Factory.StartNew it takes from 1 to 10 seconds before the newly created thread starts executing.

What is the reason for this very slow thread execution start?

Update: The delay is excatly 500 msec

See Question&Answers more detail:os

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Found out that the thread pool can be unwilling to start more than one new thread every 500 msec when the number of thread pool threads used are over a specific value. However increasing MinThreads using ThreadPool.SetMinThreads - even though it is not recommended - to 100 enables me to create 100 threads without the 500 msec delay.

Here's what helped me:

Edit:

Here's what I ended doing in App.xaml.cs (in the constructor):

// Get thread pool information
int workerThreadsMin, completionPortThreadsMin;
ThreadPool.GetMinThreads(out workerThreadsMin, out completionPortThreadsMin);
int workerThreadsMax, completionPortThreadsMax;
ThreadPool.GetMaxThreads(out workerThreadsMax, out completionPortThreadsMax);

// Adjust min threads
ThreadPool.SetMinThreads(workerThreadsMax, completionPortThreadsMin);

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