Assuming you have found the correct magnet link or torrent file for Kingdom.Come.Deliverance.Update.v1.3-CODEX + fg-kingdom-come-deliverance-codex :

Here is a detailed breakdown of the critical fixes and features introduced in the v1.3 patch:

Resolves stuttering issues in crowded cities like Rattay.

Minimizes late-loading graphics and pop-ins.

The Update v13 for Kingdom Come: Deliverance brings a plethora of changes and improvements to the game. Some of the notable changes include:

Beyond gameplay, patch 1.3 was a performance lifeline. It promised "improved performance" with "LoD switching tweaked, reducing pop-in and improving texture streaming". It also reduced stuttering in several areas and offered a slightly smoother frame rate on systems using Vsync 30. For PC players, the update added new graphics options, including the ability to "select different types of anti-aliasing" and set Vsync to 30 or 60 FPS, or disable it entirely.