Players found ways to slow the game down as the 2023 season progressed under the new rules, so MLB is taking steps to counter that:

Major League Baseball’s competition committee approved several rule changes for the 2024 season, including subtracting two seconds from the pitch timer with men on base — from 20 to 18 seconds — while also widening the runner’s lane to first.

Previously, batters had to essentially run on the dirt between the foul line and 3-foot line or be in risk of being called out for interference. Now, that lane will extend to the cut of the infield grass. The distance between the foul line and the infield grass will be between 18 and 24 inches in all parks, with some limited grace periods granted by MLB due to difficulty in modifying the field.

The rest of the changes for 2024 relate to the pace of the game as the league tries to trim time on the margins. MLB said the average nine-inning game increased by seven minutes from April to September last year, the first season with a pitch clock.

ESPN.com

For example, pitchers were delaying the start of the clock by walking around the mound. In 2024, the pitcher having the ball is enough to start the clock, even if the pitcher is not on the mound.

I’m very glad MLB is fighting back against this I suspect if they had not, games would be up another seven minutes by the end of the 2024 season.