Tesco shoppers hoping to book a Christmas delivery slot this morning were placed in a queue of more than 290,000 people waiting to get online.
When The Mirror checked shortly after 7.30am, we were number 291,352 in the queue and told the wait time was "more than one hour".
Some customers also took to Twitter to complain about being chucked off the website when it was their turn.
Tesco Delivery Saver customers were able to book a slot from 6am this morning (November 15) but some shoppers say there was already a queue by this point.
One person said: "I’ve waited patiently in your queue for two hours got my opportunity and the website has crashed."
Another tweeted: "Noooooo!!! Not again @Tesco!!
"In the queue for #christmasdelivery since 5:30am, got down from 42,000 to the front, website opened and immediately crashed and put me back to place 225,000."
A third said: "Hey @Tesco just sat for half an hour in your xmas queue and as soon as I reached the front of the queue I got kicked out and now the wait is an hour."
Another commented: "I was 38,000 in the queue and the app ‘refreshed’ itself and now I’m number 178,000. You’re having a laugh."
A Tesco spokesperson told The Mirror that the issue was resolved shortly after 11am.
"Online Christmas slots are now available for Delivery Saver customers on our website and Groceries app after some customers temporarily had difficulty logging on or placing orders this morning," they said.
"We're really sorry about that and it has now been resolved with slots available for both Home Delivery and Click+Collect over the Christmas period."
Tesco says it has over 1.2 million slots available in the week leading up to Christmas.
The slots that became available today are for customers with Delivery Saver plans only. Slots for other shoppers will open on November 22.
Tesco delivery pass prices start from £2.49 a month, or £14.94 a year, for click and collect, while off-peak delivery passes cost £4.99 a month, or £29.94 a year, for next-day deliveries.
The most expensive anytime Tesco delivery plan costs £7.99 a month, or £47.94 a year, for same day deliveries.
