Do you use the {speed_travel} replacement pattern in your start gcode? If so, don't. Cura inserts the number that is configured in the interface, which is specified in mm/s. Marlin expects the number to be in mm/min. So the number that gets inserted if you use {speed_travel} in your start gcode snippet is 60 times lower than the number that you would expect.
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GregValiant 980
This is the first extrusion at the start of the skirt:
G1 F600 X293.558 Y133.875 E0.02713
later in the file there is a travel move and then
G1 F600 X259.268 Y209.955 E182.36614
So the print speed is 10mm/sec.
There are a couple of things to look at. In the cooling section the "Minimum Layer Time" will cause Cura to slow down the print speed in order to allow the layer to cool. In the case of something like a spire, or the smokestack on a Benchy the Minimum Speed will come into play.
If there is an M220 in your StartUp Gcode it will affect the speed. M220 S100 will insure that a print always starts at 100% of the speeds dictated by the gcode. M220 S50 would tell the printer to cut all the speeds of the gcode to 50%.
To the right of the Setting Search box is the Settings Visibility button. Click on it and set the visibility to "All". Then go down to the speed section and see if something is set low.
You can also post a project file here ("File | Save Project") and all your settings will be in the file.
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