Quite fast

Positive parts
I was using paid plugin from codecanyon. it was asking to install another plugin called framework.
Based on code profiler pro, I have gain 0.2 seconds for each page.
So, this is fast.

Negative parts

1. Re-order attributes is not easy on admin. Let’s say I have added 10 attributes first. Then try to add new one on top of them. I have to delete all and add back with desired order. It should use woocommerce style order with letting us to move by mouse.
2. Front end tables are too narrow. I have plenty of space but squeeze everything to left.?
3. We may need Main Group for groups. Like for laptop, CPU specs, RAM specs, Screen specs. Then we should able to add all of them in Laptop main group.
4. CSS should be better for layout 1.
   Here is my solution to make it better looking
   

/* WPC Smart Attribute Groups for WooCommerce */
.woocommerce table.shop_attributes td {
    text-indent: 10px;
    text-align: left;
}
.woocommerce table.shop_attributes tr:hover {
	background-color: #D6EEEE;
}
.woocommerce table.shop_attributes th {
	width: 40%;
	text-align: left;
    font-weight: 500;
}