Hoy and Pedio, do your PCs specs meet the minimum requirements (particularly the graphics card)? If not, expect such issues with large Gcode files. Note: There is no limit for GPU RAM but the larger the Gcdoe files, the more you need.
Also, why use a laptop? Not that you can't, but since the PC controlling Mach should be a dedicated PC (with no apps loaded non-essential to Mach particularly antivirus) I have never been able to come up with a reason to use a laptop.
I have a HP desktop that is dedicated to running the machine. What are the minimum specs and I will check. Let me know hot to check the graphics card.