This means that the threads can't be blocked forever. The way Go scheduler work is to check during function calls if the current goroutine has executed for some period of time, after that the scheduler will remove the goroutine from the thread and open space for other goroutines to execute. But if you're doing a loop without function calls, imagine a for {}, in this case, the thread will be locked forever. Now with 1.14, this don't happen anymore. In my opinion the expected result will be better tail latencies.