The Anubhav portal was launched in March 2015 at the behest of the Hon'ble Prime Minister for retiring government officials to leave a record of their experiences while in Govt service .
Preloading or deferring CSS and JavaScript has a big impact on Core Web Vitals — especially
LCP, FID, and even CLS indirectly. When done right, these techniques reduce load time, unblock rendering, and free up the main thread for user interactions.
Here's how each technique affects Core Web Vitals:
1. Preloading
Preloading tells the browser "Hey, I’ll need this resource soon, please fetch it early."
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Preloading or deferring CSS and JavaScript has a big impact on Core Web Vitals — especially LCP, FID, and even CLS indirectly. When done right, these techniques reduce load time, unblock rendering, and free up the main thread for user interactions.
Here's how each technique affects Core Web Vitals:
1. Preloading
Preloading tells the browser "Hey, I’ll need this resource soon, please fetch it early."
Affects:
What to Preload:
Example:
2. Deferring JavaScript
Deferring scripts avoids blocking the browser from rendering the page.
Affects:
Use
deferorasync:3. Deferring Non-Critical CSS
Too much CSS can delay rendering — especially if it’s render-blocking.
Affects:
How to Optimize CSS:
Common Mistakes
Tools for Diagnosis