What is LCP by LLM Engine
LCP by LLM Engine shows how different large language model (LLM) engines contribute to delays in Largest Contentful Paint (LCP) on your pages.
This lens helps you identify which AI-powered LLM services - such as chatbots, content generators, or personalization engines - are affecting the critical loading time of your largest visible content.
Only LLM engines that were active and measurable during the selected period are listed. LCP is the most popular vital from the Core Web Vitals and represents the loading time of the largest element on the page.
Healthy LCP by LLM Engine sample
Should you worry
In a healthy scenario, LLM engines have minimal to no negative impact on LCP. You may see them listed, but they won’t trigger yellow or red warnings. This indicates that the AI components are efficiently integrated and don’t block or delay rendering.
A healthy setup typically includes:
Asynchronous calls to LLM APIs that don’t block page rendering.
Caching of frequent AI-generated responses.
Progressive hydration or lazy loading of AI-powered content after main content loads.
If LCP values remain green for all LLM engines, your AI integrations are well-optimized.
Unhealthy LCP by LLM Engine sample
When an LLM engine negatively impacts LCP, it usually means it’s causing delays that slow down the loading of the largest content on the page. This can happen because of:
Redirects triggered by the LLM service before the main content loads.
Slow API response times from the LLM, delaying content rendering.
Blocking scripts or resources required by the LLM that hold up the page.
Extra network requests or heavy data processing caused by the AI integration.
Common scenarios include chatbots or AI-powered personalization tools that take too long to respond or load essential assets.
If you see consistent yellow or red LCP values tied to a specific LLM engine, it’s a clear sign that the AI integration is slowing your page down and needs optimization.
Resolving unhealthy LCP by LLM Engine
Go-to action plan to resolve an unhealthy LCP by LLM Engine:
Ask Uxi to analyze your LCP by LLM Engine values and suggest improvements.
Use Filters to isolate pages or user journeys where specific LLM engines cause delays.
Simulate LCP of the suspected lens to see if fixing it will resolve the slow LCP by LLM Engine. If yes, this is where the resolution focus should be.
Use an automated LCP optimization tool like Navigation AI to improve your LCP by LLM Engine values.
Once you’ve improved LCP, set an alert to be the first to know if it starts worsening again.
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