Yeah traffic is noticeably slower. /fit/ was never a super fast board but at its peak you'd see threads getting 300 replies on a consistent basis and threads would rarely ever last more than 24...
I'm a lurker from 4chans /fit/ board. I started posting on /fit/ in 2011, back then there was a huge overlap in the userbase on /fit/ and the misc. Seems like 80% of people that used /fit/ also...