Paul, it's good to talk to you. As you know well, we've talked about stores as hubs now for going on 4 years. And we have always said, we like it for a couple of reasons: One, great guest service; and two, better economics. Same-day services are that on steroids. They have much better economics than shipping something to someone's home because, as we've talked about, the shipping expense is the biggest part of delivering something to someone's home. So if we take that out of the equation, then we end up with economics that are much closer to the store transaction.
The thing we love about all of the same-day services, pick up, Drive-Up and ship, all of them continue to grow faster than our overall digital growth, and we continue to find ways to improve them, as you said. Part of that is investing in technology for our teams, improving their sort paths and improving how they pick. We've done a great deal of process work to break things apart, to make it simpler for our teams to execute. We've done things to help them find items in the store so that we don't end up with what we call, INFs, or items not found.
And then we continue to invest in helping them physically. And that's a big focus for us this year and will be over the next couple of years. In the case of Drive-Up, which as we've talked about a couple of times, Brian talked about and I talked about, has been our fastest-growing same-day service since -- basically since we started it. It also has our highest NPS score, so guests love it. We let you decide when you want to come. We don't force you into a time slot. And then our team brings it out to you in 2 minutes or less. So our guests absolutely love that. And you'll see us invest in making that easier for our team, building capacity on the front end of the store.
Over the past year, we've rolled out adding temperature control products to Drive-Up. And so you'll see us have refrigeration and freezers to the front end of the store, all behind the wall so that our guests don't see that, but making it much easier for our teams to execute. And then much safer, we'll make it much easier for them to walk out to cars, protect them from the environment a little bit. So all of that experience continues to improve as well.
So every year, our team comes up with multiple ways to continue to improve the service, first and foremost, for the guest, and then on the back end, improve things for our team so they can execute it easier as we continue to grow. So we see a lot more opportunity for us. And as I said, that will be a big part of our capital investment over the next several years.