WebDriver findElements takes forever in Katalon 7+ versions

When testing a complex page on Katalon 7+, using findElements function takes a very long time. (30+ seconds)

Testing the same code on Katalon 6.3.3 takes under a second.

Code example:
WebDriver driver = DriverFactory.getWebDriver();
List elements = driver.findElements(By.cssSelector(".header .menu:nth-child(5)"));

Was something broken in the newer versions? why is this so slow?

What is the length of the the result returned by .header .menu:nth-child(5)

Using td:nth-child(5) on a fairly dense page, I’m getting a length of 39 with a timing resolution of less than 1 second.

It should return 1 item in my case