The phrase "slow starters" refers to people or things that take a while to begin or get going. They may need more time to warm up or get into a rhythm before they can perform at their best. Full definition
These guys have been slow starters for years now and it's actually an encouraging start for them as they always seem to turn it on in the last portion of the Season. (allsportsseries.com)
Sometimes slow starters will really take off later in the season and catch up with the other plants. (fieryfoodscentral.com)
They have been slow starters throughout the league and sometimes they are able to fight out of it and sometimes it's just too big a ditch to climb out of.. (allsportsseries.com)