Transferred bytes
Shows the amount of data transferred during the current synthetic browser load.
Free website page analyzer
Analyze page weight, resources and browser cost.
Use this website page analyzer to inspect transferred bytes, resource count, bandwidth-heavy assets, JavaScript impact and the page-speed context around them.
Free · No signup required · Real Chromium lab test
What this tool measures
Page size is more useful when you can see what is creating it
Resource count
Counts the resources requested by the page so request proliferation is visible alongside byte size.
Bandwidth-heavy resources
Highlights individual assets SiteState identifies as consuming significant transfer weight.
JavaScript CPU
Separates network weight from execution cost so a small but CPU-heavy script does not disappear.
Third-party impact
Keeps externally hosted scripts and resources visible when they add transfer or browser work.
LCP and load timing
Connects page weight with what actually happened to the page-load milestones.
Interpret the result
A heavy page is not automatically slow, but excess weight creates more work.
Images, JavaScript, fonts, CSS, video and third-party resources all contribute to the transfer footprint. More bytes generally mean more network work, but the impact depends on caching, compression, connection quality and whether those resources are needed for the first render.
SiteState therefore treats page weight as evidence, not a universal score. The report combines transfer size with render-blocking, LCP and JavaScript diagnostics to show where the weight is most likely to matter.
Methodology
Transferred bytes and resource counts come from the controlled Chromium load. Results represent the current test run and can vary with caching headers, conditional resources, personalization and third-party content.
FAQ
Common questions about this speed test
What does a website page analyzer show?
SiteState analyzes the live browser load and reports page weight, transferred bytes, resource count, heavy resources, JavaScript CPU, third-party impact and related loading metrics.
What is page weight?
Page weight is the amount of data a webpage transfers while loading, including images, JavaScript, CSS, fonts and other resources.
What is a good website page size?
There is no single ideal size for every website. The practical goal is to avoid transferring bytes and resources that do not contribute enough value, especially on the critical rendering path.
Why can page weight change between tests?
Dynamic content, ads, third-party scripts, cache behavior and responsive assets can change which resources load and how many bytes are transferred.
Can SiteState track page weight regressions?
Yes. Synthetic monitoring can track transferred bytes and resource counts over time as part of the wider regression engine.
Related free tools
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See page weight inside the complete speed report.
Open toolRender Blocking Resources Test
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Open toolWebsite JavaScript Performance Test
Measure execution cost separately from network weight.
Open toolPerformance Monitoring
Track page-weight and performance changes continuously.
Open toolContinuous performance
Need more than one test? Website performance monitoring keeps compatible browser metrics and regression history over time. Performance.
A one-off speed test is only a snapshot.
SiteState can keep the same website under continuous monitoring and detect when performance changes.