Sitejump

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Image weight and mobile speed, explained

Oversized images are usually the primary cause of a slow website. Sitejump optimizes these files during migration and benchmarks your homepage before and after the move, turning performance into a measurable result.

How we handle your images

We keep your original files as a fallback and generate modern WebP versions only when they offer a genuine reduction in size. High-resolution photos are resized to a practical maximum, while unnecessary metadata and bulky color profiles are stripped out. Logos, favicons, SVGs, and animations are preserved exactly as they are.

Why page weight matters

A browser cannot display a photo until it has finished downloading it. A 2 MB hero image takes significantly longer to load on a mobile connection than a compressed version, even if they look identical to the human eye. Reducing weight leads to a faster first impression and lower data usage for your visitors.

Smooth loading and layout stability

Sitejump extracts the dimensions, dominant colors, and a blurred preview for every suitable image. This allows the rebuilt page to reserve the correct space immediately, preventing the layout from jumping. We prioritize images at the top of the screen, while those further down the page load just before the visitor reaches them.

Understanding the mobile speed score

The performance score is a 0–100 summary of how a page behaves during a simulated mobile visit. It measures how quickly content appears, how stable the layout is, and how fast the page responds to input. It is a helpful benchmark for comparison, rather than a fixed guarantee for every visitor.

Benchmarking the migration

The free audit runs a single check on your current homepage. Once your new site is live, the migration assistant performs the same check on the rebuilt version and compares the scores. If a speed test is temporarily unavailable, it won't block your migration and can be retried at any time.

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Sitejump is developed and operated by miPlug.