Page Size Analyzer

Analyze page size and performance — HTML weight, TTFB, resource counts, lazy loading, compression.

HTML sizeTTFBResource count~2 seconds
This tool analyzes the single URL you enter, not your entire website.
Analyzing...Running checks. This usually takes a few seconds.

What We Check

Every check comes with a pass/fail result and specific fix instructions.

HTML Size

Large HTML slows initial render. Keep under 100KB for fast parsing.

TTFB

Time to First Byte measures server response time. Under 500ms is good.

Load Time

Total response time including content download. Under 2s is the target.

Compressed

Gzip/Brotli compression reduces transfer size by 60-80%.

Js Count

Each JavaScript file is an HTTP request. Bundle and minify to reduce count.

Css Count

Multiple CSS files add latency. Combine into fewer files.

Img Count

Too many images slow initial load. Use lazy loading for below-fold images.

Lazy Loading

loading=lazy defers offscreen images, improving initial page load.

Inline Css

Large inline CSS blocks the parser. Move to external stylesheet for caching.

Inline Js

Large inline JS blocks rendering. Move to external file with defer/async.

Why It Matters

Numbers that make a difference for your website.

10

Metrics

Complete performance picture

TTFB

Target

Under 500ms server time

100KB

Goal

HTML size target

60%

Savings

With compression enabled

Frequently Asked Questions

Common questions about this tool and how to use the results.

What is TTFB and why does it matter?
Time to First Byte measures how fast your server responds. Under 200ms is excellent, under 500ms is acceptable. Slow TTFB affects all other metrics.
How big should my HTML be?
Under 100KB is ideal. Large HTML (often from inline CSS/JS or excessive DOM elements) slows parsing and increases memory usage.
Should I use lazy loading on all images?
Use lazy loading for below-fold images only. Above-fold images (hero, logo) should load eagerly for best LCP.

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