The need of images optimizationObviously, images are important to any website. An image can say more than a thousand words. In SEO on-page technique, the alternative text of each image plays a vital role. However, many people still upload large pictures that leads to slow loading websites.
A 1 second delay in page response can result in a 7% reduction in conversions – Kissmetrics –
How to do images optimizationThere are WordPress plugins for optimizing images during uploading. However, images pre-processing is more important, I believe. You can do several things:
- Choosing the correct image dimensions. Don’t use too big images for small space. A typical camera now can quickly take photos at 3500 pixels in width, but do you really need that size for your website?
- Choosing the correct image resolution. Printing requires 300 dpi, but the ideal number for web images is only 72 dpi.
- For JPEG and GIF, I choose 80%.
- For PNG, I choose 60%.