[dwayne12345]

Team Chemistry is pretty self-explanatory imo. If it's on then there is a team chemistry rating between 0%-100%.

There is also a team chemistry effects. If that is also on a team with low chemistry will see player's ratings decreased and teams with high chemistry will see player's ratings increased.

Teams lose chemistry when they make roster moves and lose games. They gain chemistry when their core has been together for years and win games.

Not sure why people turn it off? It's a pretty realistic feature that simulates a player performing worst on low chem teams and players on high chemistry teams overplaying.

Think this year's Miami Heat or the 2000's-2010's Spurs as what high chemistry looks like.