Loading a big file

[BasHIDAP]

I'm running Mach on a gantry machine. Sometimes, when I load a big file, the movement of the machine becomes iregular and less fluendly as normal. This even happends while jogging.
If I go back to a smaller file the problem is gone.
What can be the reason and how do I solve it?

[ger21]

Turn off the toolpath display.