What is the performance impact of using async vs defer in script loading?
An example of an AI chatbot conversation about the performance impact of async vs defer in script loading.
What is the difference between async and defer when loading scripts?
The 'async' attribute allows the script to be downloaded in parallel with the page, executing as soon as it's ready. 'Defer' also downloads the script in parallel but waits to execute until the HTML is fully parsed.
Which one is better for performance?
It depends on your use case. 'Async' is better for scripts that don't depend on other scripts, while 'defer' is ideal for scripts that need to run after the document is fully loaded.
Can you give an example of when to use each?
Sure! Use 'async' for analytics scripts that can run independently. Use 'defer' for scripts that manipulate the DOM after the page is loaded.
Are there any drawbacks to using async?
Yes, if multiple scripts are loaded with 'async', they can execute in any order, which may lead to issues if one script depends on another.
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