Release notes for 665

New Explorer - Changes styling of dragging and dropping indicators to be less obtrusive.

Introduces three-phase rollout for updates to the sleep system.

Optimizes Instance:FindFirstChildWhichIsA() 20x for parent instances with many children. Optimizes Object:IsA() 30%.

SurfaceAppearance updates:

• Adds new alpha blend mode for SurfaceAppearance: TintMask.
• Streaming LOD Meshes more accurately represents the Surface Appearance alpha blend modes.

Improves memory usage of EditableImage.

Improves the IKControl solver for the two-bone case.

Enables physics/datamodel/scripts to all re-simulate together.

Improves shader load times on DirectX.

Terrain updates:

• Grass blades on terrain now are more randomly distributed with less apparent repetition.
• Fixes a bug that caused straight lines with shorter or missing grass blades to appear on terrain.
• When editing terrain in Roblox Studio, the grass blade positions are updated continuously and not just after large changes.

New Explorer - Explorer no longer smooth scrolls.

New Explorer - Fixes long names not giving a horizontal scroll bar again.

Fixes an issue where installed fonts disappear in dropdown list.

In the New Luau Type Solver, users will be less likely to see blocked types and "constraint solving incomplete" errors when doing basic math.

Fixes an issue with require-by-string's autocomplete not inserting escape characters like \\, \", and \' when necessary.

Fixes an issue that causes autocomplete to insert invalid Instance names when using require-by-string.

PreloadAsync call will fail on a VideoFrame instance that is not in a DataModel.

New Explorer - Fixes bugs relating to clearing searches, especially with debugger open.

Fixes issue where Avatar Setup gets stuck on the uploading stage for non-humanoid avatars.

New Explorer - Scrolling now works on Windows while dragging. For Qt users: Qt has no native way to solve this, you need to use SetWindowsHookEx to capture the scroll input.

Fixes "Game Settings" and "Download as Copy" being disabled when the Script Editor is open.