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Online speed tests like WebPagetest.org or Pingdom.com may recommend optimizing images.This can be a lot of work and often make little or no difference in the page speed. Why?
Images load in parallel in the browser. They all happen at once. With some exceptions for fat PNG images. So halving the image weight doesn’t half the load time. It may only make a small improvement like 5 percent – or none.
There are the original image size and the mathematically scaled image size. In theory, making the images the actual size would reduce page weight. But do the speed results improve much? Let’s find out:
255.9 k JPEG image format
2,560px × 786px
(scaled to 1,366px × 419px)
Blog post featured image
57.6 k JPEG image format
1,024px × 384px
(scaled to 710px × 266px)
Both pages load in about 400 milliseconds using a browser timer measurement.
In this example, 200k reduction reworking image optimization makes no difference in speed.
Our recommendation: Ignore test recommendations. Usually. Keep the gain in perspective. Don’t waste your life chasing unrealistic goals
Optimizing or resizing these images more won’t make any difference in speed.
On some sites, it makes a big difference. If the images loading in parallel take 4 seconds or more to load, you have an image optimization problem.
Here are suggestions to fix it:
PagePipe Site Tuning Services for Speed
Instead of band-aid approaches, we drill down to the root cause of your slow site. This is origin optimization. Also known as site tuning. To do this, we analyze site components:
- Scripts and third-party services.
- Images and media library.
- We minimize globally loading plugin effects.
Find out more details about Site Tuning – Get Speed!