Hi Guillaume_C,
I understand that you are having issues with your printing speed. The product must pause for each page to be formatted before it prints. Complex pages take more time to format, resulting in reduced print speed. However, most jobs print at full engine speed (35 ppm on Letter-size media or 33 ppm on A4-size media).
I hope that this answers your question.
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I work for HP. If this answers your post, please leave a Kudos.