If you experience freezing while using Yahoo Messenger, the program is likely using more memory than your computer has available.
Yahoo Messenger also allows you to participate in voice or video chats with your contacts. Yahoo offers several products, including the messenger client that you download to your computer to allow you to chat with and share files with them. If your computer temporarily stalls or becomes sluggish, this is known as lagging.
When this happens, your computer becomes unresponsive and you will need to restart it with the power button, rather than the user interface. Freezing generally occurs when your computer is running a process or program that demands more resources, such as processor power or random access memory - RAM - than your computer has.