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This property toggles whether the game will use the Projected Gauss-Seidel physics solver or the legacy Spring physics engine. It cannot be set by Script|Scripts and should only be changed in Roblox Studio.

What is the PGS Solver?

The PGS Solver is Roblox’s state of the art physics solver which offers a range of simulation capabilities not available in Roblox’s legacy solver.

It is currently the default physics solver used by Roblox. Developers should expect the legacy physics solver to be deprecated or removed at some point in the future.

For more information on the PGS Solver, please see Articles/Building with PGS|this article.