Console.Writeline Effect on Performance

Question

I have an application that has 4 threads. Each thread is actually a Timer and does a seperate job in specific intervals. These threads show

Answer 1

There may be two issues with Console.WriteLine in regards to performance:

1. IO is not typically a "fast" operation.

2. Calls to WriteLine are synchronized, i.e. if two threads want to write, one of them blocks on the WriteLine waiting for the other to finish writing. From MSDN on console:

I/O operations that use these streams are synchronized, which means that multiple threads can read from, or write to, the streams.

That said, the only way to understand if the time spent on Console.WriteLine has an impact on the performance of your specific application is profiling it. Otherwise it's premature optimization.