Hello,
Your products have a lot of variations and if you keep variation swatches enabled on grid http://prntscr.com/pbtkce it requires a lot of the resources and related products that have these variations on grid cause the page crash. At the same time, your server does not fully meet theme requirements http://prntscr.com/pbt812 So, try to update server limits to min required or disable swatches on grid http://prntscr.com/pbu1gj
Besides I don’t think that this long list of the variations will look nice http://prntscr.com/pbu23a for the product grid
Regards