So, I ran a Visual Studio CPU usage profiler session for application. After the end of it, in report I was seeing this:
But what is "category"? Specifically, what does IO: 59,2% means? Does it mean, that 59% of my application CPU usage was used to wait for I/O (then I should probably use asynchronous operations for this I/O)? Or is it just the usage of functions related to IO (functions that doing I/O somewhere, but not only it)? Or maybe something else?