Making the switch seemed to greatly effect my game (which is a hockey game, played on low friction Ice [which was .18]). I noticed that the default forces used to Move the Character gained significant Power, as in acceleration and deceleration was almost instant (even on .05 friction Ice at a weight of 5, and .2 friction on the legs). Also the BodyForce I applied to the player (to help him gain speed on old setting) seemed to have no effect on the new settings. [Note: I use a walkspeed of 32 to 48 in my game, not your typical 16].
However, I did manage to solve this problem by making all of the parts of the Character’s Density set to 10 and multiplying the Force of my BodyMover by about 12 and instead of aiding the players movement, I had to use the force in the opposite direction (to counter the major increase in Power of the Character’s default movement).
To see the effect of the change you can use your hacks to take a look at this place in Studio:
Instructions on Test Place
1. Open it in Studio and Start Server with 1 player 2. Equip Tool and jump onto the Ice Part (White Part). 3. Move around with the Physics setting on Legacy 4. Press K to toggle the BodyMover I explained earlier. Without the bodymover the Player can't move on the Ice in Legacy Mode. 5. From the Client Window, Set the Physics Setting to "New" 6. Notice the change in movement of character and that the bodymover has no effect on the Player whether it's on or not.SideNote: if you deselect the Tool it will break your arms, and will have to reset.
If you want to see the steps I took in the second paragraph in action, you can visit this place:
From Lobby you will have to use the Left Hand Menu and click on the buttons in this order:
Choose Server>Test Servers>Test Server 2>Play
Just thought I should state my findings, and what worked for me.