@catshow This is the first few lines of that gcode file:
;FLAVOR:RepRap
;TIME:851
;Filament used: 0.758723m
;Layer height: 0.2
;MINX:144.2
;MINY:147.7
;MINZ:0.3
;MAXX:185.8
;MAXY:182.3
;MAXZ:17.9
;Generated with Cura_SteamEngine 4.6.1
T0
M190 S60
M104 S200
M109 S200
M82 ;absolute extrusion mode
G28 ;Home
G1 Z15.0 F6000 ;Move the platform down 15mm
;Prime the extruder
G92 E0
G1 F200 E3
G92 E0
M83 ;relative extrusion mode
G1 F1500 E-6.5
;LAYER_COUNT:89
;LAYER:0
M107 P1
G0 F3600 X148.623 Y149.849 Z0.3
;TYPE:SKIRT
G1 F1500 E6.5
G1 F1800 X149.222 Y149.334 E0.03941
G1 X149.87 Y148.883 E0.03939
G1 X150.561 Y148.499 E0.03944
G1 X151.286 Y148.187 E0.03938
Seems fine, and the slicer (Cura) isn't changing motor settings. Print speed for the first layer is set at F1800 which is 30mm/s, and increases to F3600 (60mm/s) for subsequent layers. Are you expecting more that this? If so, increase the speeds in the slicer. Your maximum speeds in config.g should allow higher speeds.
Ian