The company formerly known as Twitter on Tuesday slowed the speed with which users could access links to the New York Times, Facebook and other news organizations and online competitors, a move that appeared targeted at companies that have drawn the ire of owner Elon Musk.

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Users who clicked a link on Musk’s website, now called X, for one of the targeted websites were made to wait about five seconds before seeing the page, according to tests conducted Tuesday by The Washington Post.

The delayed websites included X’s online rivals Facebook, Instagram, Bluesky and Substack, as well as the Reuters wire service and the Times. All of them have previously been singled out by Musk for ridicule or attack.

The delays also affected X’s biggest rivals in social media. Links to Facebook, Instagram and the new microblogging service Threads were all throttled; all three are owned by Meta, whose founder and chief Mark Zuckerberg has been locked in an ongoing online feud with Musk over not-yet-existent plans for a mixed-martial-arts fight.