Virb Edit extremly slow on MacBook pro exporting videos

Hi Guys

I'm exporting some videos with the overlay and it's extremly slow.

Is there something I can do abotu it?

These are the specs of my laptop

MacBook Pro (Retina, 15-inch, Early 2013)
2,7 GHz Intel Core i7
16 GB 1600 MHz DDR3
Intel HD Graphics 4000 1536 MB
500 GB SSD