First do not use the PCL6 Driver for universal print as it can be extremely slow on a large busy network. For optimum data rate there should be only one switch between the MP C3003 and the computer or print server.
In User Tools - Printer Features - Host Interface set I/O Buffer to it largest.
Under Print Quality settings:PCL5c:
Try change the True Type Mode setting to Download as bit image.
PCL6:
Try setting the resolution to 600x600. Most text documents do not need anything higher than 300x300 but most newer machines only go down to 600x600. Unless they are doing highly precision graphics, 2400x600 equivalent is not needed and takes up processing time ion the MP C3003.
These should help but with a 400+ page document anything can happen. It might be better to print only 20 or so pages at a time.
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