Large images are one of the most common causes of slow website loading times. When images are too big, they take longer to download, making your website feel sluggish. A slow website can frustrate visitors, increase bounce rates, and negatively affect SEO rankings.

Here's our guide to creating and using the correct images sizes so your website performs better. 

3 Key Things That Affect Image Size

Dimensions (Size in Pixels)

• If an image is too large, the file size increases unnecessarily.
• Resize your images to the recommended dimensions below to keep them efficient.

File Type (Format)

• Different file types affect file size.
• PNG files are the largest, while JPEG files are smaller and still maintain good quality.
• ASP will automatically convert images to WebP for browsers that support it, but starting with the right format helps.

Compression

• Many images are uploaded without compression, meaning they are larger than they need to be.
• Don’t worry about this step—ASP will handle it automatically.
• Your job: Resize the image and, if possible, save it as a JPEG instead of PNG.
   

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Recommended Image Dimensions & File Types

Image Type	Max Dimensions (px)	Max File Size (KB)	Best Format	Notes
Hero Image	1920px wide	450KB	JPEG / WebP	Large banner images should be compressed well.
Article Image	1200px x 600px	150KB	JPEG / WebP	Used in blog posts or news articles.
Show Logos	400px wide	50KB	PNG / SVG	If possible, use SVG for sharpness on all screens.
Sponsor Logos	150px wide	15KB	PNG / SVG	Avoid large PNGs for simple logos.
General Web Images	1000–2000px wide	200KB max	JPEG / WebP	Photos should be in JPEG unless transparency is needed.

How to Optimise Your Images in 3 Easy Steps

Step 1: Resize Your Image to the Correct Dimensions

• Follow the dimensions listed in the table above.
• There are lots of online tools that will help you resize your images, including Canva

Step 2: Choose the Right File Type

• JPEG is best for photos (smaller file sizes).
• PNG is only needed for transparency (logos/icons).
• If possible use WebP, but ASP will handle this conversion for you.

Step 3: Upload Your Image

• If you’ve resized and saved as JPEG, you’re done!
• If you're using the ASP CMS system (ShowOff) it will compress the image automatically when you upload it.
   

That’s it! Follow these simple steps to keep your website running fast and efficient.

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We offer fast, tailored optimisation support for events of all sizes, from quick wins like fixing heading tags and page titles, to full content optimisation and year-round traffic strategies.

Whether you are planning your next campaign or trying to reduce PPC waste, optimising your website will help you:

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