If you have issue when your Portfolio gallery have been taking unusually long times to load, these are some tips that might be helpful for you:
– maybe you have installed some third party plugins. Try to deactivated them all and then activate them to test one by one.
– try to clear your cache
– we recommended you to set all image in portfolio with same size. In that way your portfolio should looks more prettier (we recommended to set your image to 960x670px).