Localhost · Production
Website fast locally but slow online?
Find out why a page that flies on localhost can struggle in production, from connection setup and cold caches to server load and third-party scripts.
Read the guideWebsite performance guides
Understand what makes a website slow.
Practical explanations for finding performance problems, understanding the browser and testing changes under controlled conditions.
Latest guides
Start with the problem you are investigating.
TTFB · Troubleshooting
How to reduce TTFB: 12 causes and fixes
Trace slow server response times through redirects, network distance, caching, application work, database queries and overloaded servers.
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Requests · Diagnosis
Do more HTTP requests make a website slower?
Understand when request count matters, why HTTP/2 and HTTP/3 change the cost, and which resources actually delay page rendering.
Read the guide
TTFB · Benchmarks
What is a good TTFB?
Put TTFB guidelines in context, distinguish lab results from real-user percentiles, and account for connection setup and geography.
Read the guide
Regions · Network
Why website speed varies by location
Explore how network distance, routing, peering, DNS, TLS, edge caching and third-party services change loading times by region.
Read the guide
Core Web Vitals · LCP
Largest Contentful Paint (LCP) explained
Learn what the largest visible content element tells you, why it may render late, and how to diagnose the stages of LCP delay.
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TTFB · Fundamentals
What is TTFB?
A practical introduction to Time to First Byte and what a browser’s first-response timing can, and cannot, tell you.
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Protocols · HTTP
HTTP/2 vs HTTP/3: which is faster?
See where QUIC can reduce connection cost, how packet loss changes the comparison and which bottlenecks neither protocol fixes.
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Images · Diagnosis
Do large images slow down a website?
Separate transfer size, pixel dimensions and decoded memory, then find the image changes that can make a real difference.
Read the guideUse the evidence carefully
A lab test is a controlled view, not the whole user experience.
Latixo loads a public webpage in Chromium from a selected Browser Node. That makes it useful for repeating a test under the same profile and comparing one change at a time.
Results still vary with location, page state, network conditions and third-party services. Read the website speed test metrics guide before drawing conclusions from a single run.
Run a website speed test