McDonald's customers are complaining it's now taking "a ridiculously long time" to get served in store - because staff are always so busy with Uber Eats and Just Eat orders.
Hungry diners queued up to 30 minutes at one branch last week while "driver after driver" arrived to take meals away.
One mum, caught in the queue at the McDonald's at the Trafford Retail Park, Greater Manchester, said: "It's terrible now.
"You used to be able to get your food in just a few minutes and now it just seems to take forever.
"You'll get your order number and you can see that you're so far down the list and you're usually surrounded by delivery drivers, all of whom seem to get their orders first."
During half-term in May, parents waited for Happy Meals at branches across the UK.
But the mum at the Trafford Retail Park outlet added in an interview with Manchester Evening News: "It wasn't full of families so that wasn't the reason. It's been like this for a while now but people seem to be getting really sick of it.
"Every time I go in there someone is complaining about the service or a wrong order. I feel sorry for the staff as they just can't keep up with the number of orders coming in.
"The milkshake machines hardly ever seem to be working. On this occasion they were out of milkshake so I asked for Fanta. They didn't have that either."
Other customers told the publication there are regularly delays at their local branches.
Some recently tweeted their frustration.
One post read: "McDonald's has gone so downhill since the arrival of Uber Eats and Just Eat etc. Staff no longer want/are allowed to serve you at the tills, waiting times are ridiculous and the restaurants are just crowded with rude and spatially unaware delivery drivers. Needs to hit the reset button."
McDonald's, which has more than 1,200 restaurants in the UK, has promised to "shake up the way its restaurants operate to reflect the increasingly diverse ways that customers can order".
While the company insists the the traditional walk-in and drive-thru "remain core to how customers order", its says the redesign of kitchens and dining areas "will better integrate digital sales channels, MyMcDonald’sApp, and make smarter use of space".
Gareth Pearson, McDonald’s UK&I chief operations officer, said: “The pace of change within the restaurant industry is relentless, and the pandemic accelerated this with digital adoption gathering greater pace.
"Our customers rightly expect to have choice in how and where they order and collect their food, and our job is to ensure that every experience is a great one.
"For this to be the case, we know we also have to provide our restaurant teams and delivery partners with the best possible environment to work in.
“We strongly believe we have to continue to invest to grow, and this investment not only addresses how customers are ordering now but provides us with a platform to continue to adapt in the future, whatever that innovation looks like.”
