First move after Start gcode, to start position (but before printing) is way too fast
By way of comparison, here's what Cura writes as the header of a gcode file.  You may want to adjust some of the default parameters in your Cura settings.  (this header was same for both the default Prusa and the default Deltabot  printer settings) 

;FLAVOR:Marlin
;TIME:67934
;Filament used: 22.2173m
;Layer height: 0.06
;Generated with Cura_SteamEngine 3.5.0
M140 S60
M105
M190 S60
M104 S200
M105
M109 S200
M82 ;absolute extrusion mode
G21 ;metric values
G90 ;absolute positioning
M82 ;set extruder to absolute mode
M107 ;start with the fan off
G28 X0 Y0 ;move X/Y to min endstops
G28 Z0 ;move Z to min endstops
G1 Z15.0 F9000 ;move the platform down 15mm
G92 E0 ;zero the extruded length
G1 F200 E3 ;extrude 3mm of feed stock
G92 E0 ;zero the extruded length again
G1 F9000
;Put printing message on LCD screen
M117 Printing...
G92 E0
G1 F1500 E-6.5