Help! QGD Semi-Tarrasch When to exchange in the center?

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CNoahSay

Hello chess.com

This game feartures a QGD semi-tarrasch where I play white. In the computer analysis i showed where the comp wanted dxc5 on many occasions. I this structure with a pawn on d4, d5, c4, and c5 I get confused.

When is dxc5 correct and when is cxd5 correct. I already know that it is useful to wait to play dxc5 until the black DSB has moved. 

Please help. grin.png

urk
The computer keeps wanting to weaken Black's central pawn. It's not necessary to do that, you can take your time.
But I can tell you that the Bc8-d7-c6 maneuver looks bad.
CNoahSay

 Thanks again urk!