Canon LBP6030w Manual page 159

Printing speed may be slower when you select this check box.
If you are using A4, Letter size, or Legal size paper, change the setting of [Wrinkle Adjustment] in the printer
driver. The improvement effect is weaker for [Mode 1] and stronger for [Mode 2]. Try the adjustment starting with
[Mode 1].
[Finishing] tab
Printing speed becomes slower if you select stronger improvement.
Are you using appropriate paper?
Check the usable paper types, and replace with appropriate paper.
Paper
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[Advanced Settings] [Wrinkle Adjustment] Select mode