Preparing your website for holiday traffic peaks: the method for Black Friday and Christmas

Why the holidays put your website to the test

During end-of-year promotions, many visitors arrive at the same time, often on their phones. A server that copes the rest of the year can slow down, or even stop responding. And every second counts: in a study published by Google, Vodafone saw its sales grow by 8% after making its page display 31% faster.

Even without an outage, every obstacle costs sales: on average, about 7 carts out of 10 are abandoned before payment, according to the Baymard Institute’s summary of studies. A slow website or a payment that hesitates, and the customer buys elsewhere.

Late 2026: seven changes to know before the holidays

In 2026, the Christmas calendar comes with a busy regulatory calendar: several rules have come into force since June, and another arrives a week before Black Friday. Nothing insurmountable, as long as you discover them now rather than in the middle of the rush.

• The withdrawal button, since 19 June

  This is the first Christmas with this obligation: across the European Union, any website selling to consumers must offer a clearly visible online function, at no cost to the customer, labelled along the lines of “withdraw from contract here”, which sends an acknowledgement of receipt. And it is after the holidays, with the gifts that miss the mark, that it will be used most. Check that it works, and that your terms of sale mention it. On WooCommerce, version 11.1, released in September 2026, includes this function: it is switched off by default and can be turned on in the advanced settings. Then add a clearly visible link to its form, for example in your footer and order emails: WooCommerce does not show it anywhere by default.

• Buy now, pay later becomes credit, on 20 November

  One week before Black Friday, “pay in 3 or 4 instalments”, even with no fees, falls under EU consumer credit rules: stronger information and a check of the customer’s creditworthiness. The obligations fall first on your provider, such as Klarna, Alma or Oney, but ask them now what changes on your payment page and in the way you present the offer.

• AI assistants must introduce themselves, since 2 August

  An AI chat assistant on your store must tell customers, at the latest during the first exchange, that they are talking to a machine. Many merchants add one to handle holiday questions: better to do it by the rules. See my guide on AI.

• €3 per item type on small parcels from outside the EU, since 1 July

  Parcels worth €150 or less arriving from outside the European Union now pay €3 in customs duty per item category. An EU handling fee of €2 per item is also planned from 1 November 2026. If you ship from outside the EU, build this cost into your prices. If you ship from within the EU, it is one more argument against distant platforms: fast delivery, with no surprise charges on arrival.

• E-invoicing in France, since 1 September

  In France, every business must now be able to receive supplier invoices in electronic format, through an approved platform. Before the big end-of-year stock orders, check that everything is in place. Sending your own e-invoices to business customers will follow, in September 2027 for small and medium-sized businesses and micro-businesses.

• PHP 8.2 gets no more fixes after 31 December

  PHP, the language that runs WordPress and PrestaShop, will receive no more security fixes for version 8.2 after 31 December 2026. If your website still uses it, move to a newer version before mid-November, or plan it for January while keeping the website under watch until then.

• French winter sales start on 6 January

  In France, sales normally start on the second Wednesday of January, unless it falls after the 12th. That is the case in 2027: they start early, on Wednesday 6 January at 8 am, until 2 February, in most of the country. Less than two weeks after Christmas: prepare your sales pages at the same time as your holiday pages.

The preparation timeline

The golden rule: every major change happens before mid-November. After that, you only touch what is essential.

1. In October, the review. Measure the speed of your key pages on mobile, check what your hosting can handle, remove unused plugins or modules and test the whole checkout.
2. Early November, the final adjustments. Promotion pages online, discount codes tested, stock and delivery times up to date, backups checked, and a call with your buy now, pay later provider before 20 November.
3. Mid-November, the change freeze. No new plugin, theme change or major update until January, except an urgent security fix, applied with a backup just before.
4. During the peaks, monitoring. An alert if the website goes down, an eye on orders every day, and someone reachable to react quickly.
5. In January, the review and the big projects. What slowed down, what failed, what worked well: it is the right time to plan major work, such as a migration, to start once the winter sales are over.

Handling the load

Your website must stay fast even when many visitors arrive at the same time. What to check:

• Hosting: ask your host what your plan can handle, and whether it can be increased for the period, then scaled back afterwards.
• Caching: it keeps a ready-made copy of your pages, so nothing has to be rebuilt on every visit. On WordPress, a caching plugin does this; on PrestaShop, settings on the “Performance” page.
• Images: resized and compressed, they display much faster, especially on mobile.
• Plugins and modules: the ones you no longer use weigh down every page. Clean up in October, not in December.
• A load test: with your host’s agreement, a rush of visitors is simulated to see how the website reacts, so problems can be fixed in time.

Measure the speed of your important pages with PageSpeed Insights, Google’s measuring tool, starting with the mobile version. And if you are still choosing a platform for your store, see WooCommerce or PrestaShop.

The checkout, tested from start to finish

• Payment

  Place a real order with each payment method. A payment that fails on Black Friday is expensive.

• Stock

  Up-to-date stock avoids selling a product that is sold out, and the cancellations that follow.

• Delivery

  Clearly show the last order date for delivery before Christmas, on product pages and in the cart.

• Order emails

  Check that the confirmation arrives, and not in the spam folder: it is what reassures the customer.

• Discount codes

  Test each code before it goes live: amount, dates, products concerned.

• Customer service

  Prepare answers to frequent questions: delivery times, returns, exchanges after Christmas.

Promotions: the rules to follow

Since 28 May 2022, across the European Union, any announced price reduction must show the lowest price applied in the 30 days before the promotion. Raising a price just before Black Friday to display a big discount is therefore forbidden. In France, the DGCCRF, the consumer protection authority, states that it checks these rules, particularly during sales and Black Friday.

Fake countdowns and fake stock shortages mislead customers: they are forbidden too. An honest, clearly explained promotion builds more trust.

Being visible at the right time

Customers start looking for gifts and deals several weeks in advance. Google gives three simple tips for promotion pages:

• Keep the same address every year, for example /black-friday/ rather than /black-friday-2026/: the page keeps its place in Google from one year to the next.
• Link to it from the home page, so visitors, and Google, find it quickly.
• Publish it in advance, to give Google time to discover it.

The basics are explained in my guide on SEO basics.

During the peaks: monitor and react

• An alert if the website goes down, by email or message, to react within minutes.
• Someone reachable on the key days, with the access details at hand.
• A maintenance page ready, in case the website must be paused for a few minutes. Google recommends that it signals a temporary unavailability, not a missing page.
• A recent backup, and the certainty that you know how to restore it.
• An eye on security: busy periods also attract intrusion attempts. See what to do if your website is hacked.

What to avoid in December

• A migration or a redesign

  Changing version or design just before the holidays means taking a risk at the worst moment. If your store still runs on PrestaShop 1.7, plan the migration for after the winter sales.

• A new plugin

  Even a useful one can slow the website down or conflict with others.

• A hosting change

  Do it by early November at the latest, or after the holidays.

• Untested promotions

  A code that applies incorrectly or a wrong struck-through price, and trust takes a hit.

Is your website ready for the holidays?

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Frequently asked questions

Sources

• Best practices for Black Friday and Cyber Monday pages (Google Search Central)
• Vodafone: 31% faster, 8% more sales (case study published by Google)
• Cart abandonment rate, summary of studies (Baymard Institute)
• Price reduction announcements: what you need to know (DGCCRF)
• Directive (EU) 2023/2673, which creates the online withdrawal function (EUR-Lex)