This is where you get to properly reducing lanes can improve speeds.
My town has a major road lined with strip malls that used to be two lanes in each direction. It was also one of the most dangerous and aggravating roads as there was always someone maneuvering for position, and sudden stops or lane changes when someone wanted to turn.
Then a few years back they restriped it, plus coordinated the lights. Now it’s one lane in each direction and that lane is a through lane. Every strip mall gets a dedicated turn lane, so there’s no more reason to maneuver, no more sudden stops or lane changes. The stop lights are more likely to let you through.
Now it’s clear and measurable, everyone’s individual speed is down, accidents are down, but stopping for any reason is way down so you get through the busy section noticeable faster. And it’s much calmer