Page speed is a core ranking factor in Google’s algorithm (Core Web Vitals). In the Czech and EU markets, where users value speed and often browse via mobile data, a 3-second delay can cost you 40–50% of your conversions.
What proper optimization delivers:Faster performance: Lightweight images load instantly, even on slow 4G/5G.
Lower ad costs: The faster your
landing page loads, the cheaper your leads from Google Ads.
SEO benefits: Google reads Alt attributes and gives preference to sites that are technically optimized.
1. Choose the Right FormatUsing only JPEG or PNG in 2026 is outdated.
WebP & AVIF: Modern standards. Compress images 30–50% better than JPEG with the same visual quality. We use them as primary formats at iuntsevich.cz.
SVG: Perfect for logos and icons. Ultra-lightweight and razor-sharp on any screen.
PNG: Use only when you need transparency.
JPEG: For photos — but only if WebP is not an option.
2. Physical Size (Pixels)There’s no reason to upload a 5000×3000 image if the displayed area is only 500×300.
Example:A product photo weighs 10 MB in its original resolution.
After resizing and compressing:
80 KB.
A reduction of
125×.
3. CompressionUse tools to remove unnecessary metadata and reduce file size.
Tools: TinyPNG, Google Squoosh, or CMS plugins.
Result: A visually identical image that loads significantly faster.
4. SEO Attributes: Alt & TitleGoogle cannot “see” an image — it reads its description.
Alt text: Should clearly describe what’s in the image and include relevant keywords.
Bad:
<img src="img1.jpg" alt="image 1">
Good:
<img src="praha-web-design.webp" alt="Corporate website development in Prague">
Rename the file: Instead of
DCIM_1234.jpg, use
montaz-klimatizace-praha.jpg.
Resize appropriately: Match the width of the content area (up to 1920px for backgrounds, up to 800px for article images).
Convert to WebP: The standard format for modern
multi-page websites.
Compress: Ensure article images don’t exceed 100–150 KB.
Enable Lazy Load: Load images below the fold only when the user scrolls to them.
For us, optimization is a mandatory step for every project — whether a complex portal or a
template website.
Automated workflowsWe configure the server to automatically convert uploaded images to WebP and generate multiple sizes for different devices (srcset).
Mobile-firstWe test graphics on Retina displays and budget smartphones to achieve the ideal balance between clarity and speed.
Clean codeNo heavy scripts for galleries. Only fast, modern solutions.
Even the most beautiful design won’t deliver results if users close the page before it loads.
We can run a full technical audit and fix the bottlenecks that are slowing you down.
Get a consultation on website optimization