ReactOS as the long-in-development "open-source Windows" project has been on quite a roll recently. Beyond [1]a big Windows NT 6 compatibility improvement and [2]fixing a very annoying usability issue , for this third week of the year there is another big change landing: a significant improvement in networking performance on ReactOS.

ReactOS finally supports asynchronous TCP connections with the latest-merged code. ReactOS developers describe this async TCP support on [3]X as:

"BREAKING NEWS:

After 10 years, asynchronous TCP support patch is now merged into #ReactOS. You can expect to see substantial performance improvements in networking apps (e.g. browsers, FTP clients, downloaders)!!!"

It was back in 2016 when [4]this Jira ticket was opened over socket connections in non-blocking mode not working correctly.

After several pull requests going through various reworks, [5]this code was merged this afternoon for asynchronous connection support. This should deliver on some fairly broad network performance improvements -- "substantial" as the developers sum it up -- with the latest ReactOS development state.



[1] https://www.phoronix.com/news/ReactOS-Starts-2026

[2] https://www.phoronix.com/news/ReactOS-Folder-Changes-Refresh

[3] https://x.com/reactos/status/2012977631499604054

[4] https://jira.reactos.org/browse/CORE-12152

[5] https://github.com/reactos/reactos/pull/8573