Cura currently heats up both at the same time. However, you can change this behavior.
Put the following code at the top of the start.gcode:
M190 S{print_bed_temperature}
M109 S{print_temperature}
Cura will see the {} tags in the start code and will not emit the default heatup commands.
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gr5 2,224
Not good! Sometimes if you overheat pla and don't print for too long it causes a jam in the print head.
Maybe you should turn on your heatbed. Walk away and then after 10 minutes start your print.
Personally I always set the temperatures in Cura all to 0. This makes it so that Cura doesn't wait and just starts printing when you tell it to. Instead you have to set the temps manually (either with ulticontroller or with Cura printing window).
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