Changing a drop down menu from a regular list to a list with Autocomplete list

In my website, I have a drop down single select menus where the list is huge and is sources from db. I need to change the list to a autocomplete list, Meaning , people can write the first 1-2-3 words which will narrow down the list size. There is about 3-5 lists need change. Right now due to the list size the page load is long and sometimes due to slow connection for some reason , it doesnt even load up. This is a quick project no need to waste time need to complete ASAP. Thanks