Turn off the Wi-Fi on your phone, walk out to the parking lot, and open your website. If you find yourself waiting, you have a slow website losing customers, and nobody will ever tell you. Visitors who leave before a page loads don’t call to mention it.
The cause is usually a short list, and we’d work through it in this order: oversized images, forgotten plugins and scripts, cheap hosting, and missing caching. Measure first, fix one thing at a time, and measure again.
A slow website losing customers never tells you
At your desk the site loads instantly, because you’re on office Wi-Fi with a computer that has opened it many times. Your customer is somewhere else. They’re holding a phone with one bar of signal and looking at three companies in the results. If your page is slow to appear, the next company is one tap away.
The cost reaches the rest of your marketing. With Google Ads you pay for the click whether or not the page finishes loading. Months of search work can earn a visitor who leaves before reading a word.
How common is it? HTTP Archive’s 2025 Web Almanac measures millions of websites using data from real Chrome users. It found that 48% of mobile websites achieved good Core Web Vitals in 2025, a lower share than on desktop. Core Web Vitals are Google’s three measures of how quickly a page shows up, how soon it responds to a tap, and whether it holds still while it loads. So about half of all sites miss the mark on the device most of your customers are holding. The figure covers every kind of site, and it can’t tell you how many visitors yours loses. It does suggest a slow mobile site is normal until someone looks.
Measure before you fix anything
Google’s free PageSpeed Insights tool takes a page address and reports how that page performs on mobile and on desktop. Look at mobile first. Google’s documentation for PageSpeed Insights sets what counts as good for each of the three measures:
- Largest Contentful Paint (LCP), how long the main part of the page takes to appear: 2.5 seconds or less.
- Interaction to Next Paint (INP), how quickly the page reacts to a tap: 200 milliseconds or less.
- Cumulative Layout Shift (CLS), how much the page moves around while loading: 0.1 or less.
A page passes when all three are good for the large majority of its real visitors. A small local site often doesn’t have enough visitor data for a single page. The documentation says the tool then falls back to data for the whole site, and sometimes has no real-visitor data to show. In the Web Almanac, loading was the measure that the fewest websites passed on phones, which makes it the likeliest culprit.
Which pages should you test? Not only the homepage. If the search that matters is tree removal in Hatfield, the page a person lands on from that search is the one to test. The same goes for any page your ads point to.
Fix the images first
On home service sites, images are the cause we come across most often, and usually the cheapest to fix. In the 2025 Web Almanac, an image was the largest element on 76% of mobile pages. On most pages, then, the loading score is really a measure of how quickly one picture arrives.
Suppose a tree service in Hatfield photographs a finished job on a phone. The file is several times larger than any website needs. It gets uploaded as it is, and the site displays it in a space a fraction of that size. The visitor’s phone still downloads the whole file before it shows the small version.
You can hand this list to whoever maintains the site:
- Resize each image to roughly the size it’s displayed at.
- Save images in a modern format such as WebP, which keeps the files smaller.
- Load images further down the page only when the visitor scrolls to them. Leave the main image at the top out of this, because the Web Almanac notes that delaying that one can be harmful.
On WordPress, an image optimization plugin can usually handle the photos already there and the ones uploaded later. Ask who adds photos to the site now, and whether they resize them first.
Then plugins, hosting and caching
Every plugin, tracking tag and chat window adds a little to the load time. Sites collect them for years. A chat tool from a cancelled service may still load on every page, next to tracking tags from two or three past campaigns. List the active plugins and ask of each one: what does it do, and what would stop working without it? Some are doing a job, such as call tracking. Take a backup, switch things off one at a time, and check that the forms and phone links still work.
Hosting is next. On a cheap shared plan, your site sits on a server with many others. When that server is slow to respond, every page waits before it can send anything, and no amount of image work fixes that. The measure is server response time, also called Time to First Byte, and Google sets an experimental threshold for a good result. Fewer than half of mobile websites met it in the 2025 Web Almanac. Who hosts your site, and what plan is it on? Better hosting costs more per month. Whether it’s worth it depends on what one extra job is worth to you.
Two more terms come up here. Caching means the server keeps a finished copy of each page ready to send, instead of building it again for every visitor. A content delivery network, or CDN, stores copies of your files in many locations, so a phone in Lansdale gets them from somewhere nearby. Many hosting plans include both, so ask whether each one is switched on. Is yours?
Last is layout shift. You go to tap the Call button, a banner loads above it, the page slides down and you tap something else. The usual causes are images with no set dimensions, fonts that load late and banners that appear after the page. According to the Web Almanac, most mobile pages already pass this measure, so yours is probably fine. We cover more of what goes wrong on a phone in our article on what happens when your website is not mobile friendly.
What speed work can’t do
A faster site gives people the chance to read the page. If the page doesn’t say what you do, where you work and how to reach you, it will simply fail to persuade them more quickly. We’ve written about how important a website is to a small business.
Speed also won’t lift you in search by itself. Google’s guidance on page experience says Core Web Vitals are used by its ranking systems. It also says good scores don’t mean a page will rank at the top, and that Google tries to show the most relevant content even when the page experience is below par.
Sometimes a site needs its images and plugins tidied. Sometimes it needs better hosting. Sometimes the platform can’t be tuned further, and a rebuild is the realistic route. A new website is not automatically the answer. If the images are sorted, the hosting is sound and the pages are still slow, the way the site was built is the likely limit. Speed is far easier to plan in from the start than to add later, so it belongs in any conversation about website design.
It isn’t a one-time job, either. New photos, a new plugin or another tracking tag can undo the work, so retest a few times a year. If we did this with you, we’d need access to the site and the hosting account, whatever you remember about who added what, and a sense of which pages matter most.
Test the page your ads point to this week
This week, run PageSpeed Insights on the page your ads or your best search lead to. Write down the three mobile results. It takes about ten minutes and costs nothing, and without those numbers you can’t tell whether any fix helped.
Then show us the site and tell us which calls you want more of. We’ll look at the pages that matter most and explain what we’d fix, what we’d leave alone and why. You can get in touch with us or call (215) 368-8900. Your first consultation is free.