Make Your Java Code Run Faster (Sync vs Async)
In a high-load environment, every single millisecond counts. In this video, we explore the massive performance difference between Synchronous and Asynchronous execution in Java.
I will show you a practical example of a facade fetching data from multiple repositories, explain why sequential blocking code is a bottleneck, and demonstrate how to rewrite it using CompletableFuture and Java 21 Virtual Threads to make your response times 3x faster.
👇 Subscribe for more software architecture and Java performance tips!
⏱️ Timestamps:
0:00 - The Problem with Sequential Blocking Code
0:22 - The Synchronous Approach (The Slow Way)
1:04 - Running the Sync Test (3000ms bottleneck)
1:24 - The Asynchronous Approach (Virtual Threads & CompletableFuture)
2:06 - Running the Async Test (1000ms - 3x Faster!)
2:54 - Scaling the Load: 5 Accounts Test (15s vs 5s)
3:16 - The Rule of Thumb: When to use Sync vs Async
#java #async #softwareengineering #backend #virtualthreads #completablefuture #programming #microservices
On this page of the site you can watch the video online Make Your Java Code Run Faster (Sync vs Async) with a duration of hours minute second in good quality, which was uploaded by the user Borys Nikolenko 07 July 2026, share the link with friends and acquaintances, this video has already been watched 23 times on youtube and it was liked by 4 viewers. Enjoy your viewing!
