var list = [],

    n = 0;

while(true) {

    n++;

    list.push(document.createElement('div'));

    list[list.length-1].appendChild(document.createElement('div'));

    list[list.length-1].appendChild(document.createElement('div'));

    if(n===100000) 

        break;

}

var list = [],

    n = 0,

    node = document.createElement('div');

node.appendChild(document.createElement('div'));

node.appendChild(document.createElement('div'));

while(true) {

    n++;

    list.push(node.cloneNode(true));

    if(n===100000) 

        break;

}