When you print on an LPT printer port, 100 percent CPU usage occurs until the print job is completed. This slows down other programs until the print job is completed. In some case, other programs may slow down enough that they seem completely unresponsive. This behavior affects all power users who have many programs running at one time.
This behavior is by design.
This behavior occurs because Windows does not have interrupt support for LPT printers.
To work around this behavior, print to a Universal Serial Bus (USB) printer port. If the printer does not have this capability, use a parallel-USB cable.
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