Delphi Embarcadero webscrapping multi website

Need only a bunch of code to do this I have a listbox with 1000 URL Need to go on each one with IDHttp and take the source page of each URL. WHen word Welcome find in the source parte the url to listbox 2. With 1 thread it take time, I think the fastest way its to use 2 to 5 thread each one download the source seperately of the URL in the listbox. Im ok with delphi I only the part of code to do this.