What are the print speeds for different paper sizes?
The printer prints up to 35 pages per minute (ppm) on A4 paper and 37 ppm on Letter-sized paper. The M428-M429 models can print up to 38 ppm on A4 paper and 40 ppm on Letter paper.
From the official HP Laserjet Pro Mfp M428 M429 F manual, page 6
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