Loading images in unselected tabs

I noticed that if you have images inside the block in unselected tabs; especially if the images are big; then you need to wait until the images are loaded. to fix this issue, I make changes on the CSS as follows:

.quicktabs-tabpage {
opacity: 1;
height: auto;
}
.quicktabs-hide {
display: block;
opacity: 0;
height: 0px;
}

I hope it helps