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async/await is available with node version 8. The code is linear for the first time in nodejs, natively. That is nice. Earlier many articles claimed that, in v8 javascript engine, a function with try/catch block is not optimized. Now, async/await requires try/catch blocks to deal with errors. So, as a developer what needs to be done to keep same the performance?
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C# Language Async-Await Async/await will only improve performance if it allows the machine to do additional work.
Async functions are available natively in Node and are denoted by the async keyword in their declaration. They always return a promise, even if you don't explicitly write them to do so. Also, the await keyword is only available inside async functions at the moment – it cannot be used in the global scope.
Yes, you read that right. The V8 team made improvements that make async/await functions run faster than traditional promises in the JavaScript engine.
top-level await is available "unflagged" in Node. js since v14.
I found a Performance of native ES2015 promises and ES2017 async functions in Node.js v8
Performance of Callbacks vs Promises vs Async Functions in Node.js v8
Both native Chrome V8 ES2015 promises and ES2017 async functions perform roughly 2 times slower than Bluebird promises using almost 2 times more memory
and
Conclusion
Node.js v8 comes with significantly improved performance of native ES2015 promises and ES2017 async functions, further boosted by the introduction of native util.promisify.
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