For the longest time, Source 2 has been the biggest motivation for releasing CS2 for the game to take full advantage of modern and more powerful systems, resulting in smoother performance and offering better mechanics and protection against cheaters.
While CS2 fared well, Valve has continued its work on its latest game engine, and the latest CS2 update is a testament to this. On 15th October 2025, Valve updated the code for the latest version of Source 2. According to them, the update should reduce the CPU usage and better utilize the single-core performance of CS2, which is still one of the most CPU-intensive games.
This is arguably the most impressive update Valve has released in a long time, and there is more to this Update Package than meets the eye. Read through the patch notes to find out.
CS2 October 15 Update Patch Notes
[ ENGINE ]
- Updated engine code to the latest version of Source 2.
- Reworked bullet penetration simulation to reduce CPU usage.
- Improved core utilization of some client particle and sound effects processing, reducing overall CPU usage when players are shooting.
[ GAMEPLAY ]
- Defusing C4 will now lower the viewmodel weapon, prevent scoping, and delay firing the weapon by 150ms after exiting the defuse.
- C4 will no longer detonate in the middle of halftime intermission or after the end of the match.
- Fixed a case where 1 tick was incorrectly subtracted from sv_predictable_damage_tag_ticks.
[ UI ]
- Major Highlight clips are now viewable from the Spectator Loadout.
- Selected player is now more visible in the Team Counter.
- Context menu in the Inventory now opens in a position relative to the cursor.
- HUD weapon mode indicator has been moved to the ammo count.
- Raindrops are now removed from weapons when switching to a dry inspect environment.
[ MAP SCRIPTING ]
- cs_script enums can now be imported and behave the same as TypeScript enums.
- CSWeaponType.PISTOL == 1
- CSWeaponType[1] == “PISTOL”
- Added enums CSRoundEndReason, CSHitGroup, CSLoadoutSlot, CSDamageTypes, CSDamageFlags and CSWeaponAttackType
- Added BOOSTS value to CSGearSlot. This is the gear slot for healthshots.
- Updated Instance.OnRoundEnd to now receive the reason
- Updated Instance.OnBeforePlayerDamage to now receive damageType and damageFlags and the result can now modify damageType and damageFlags
- Updated Instance.OnPlayerDamage to now receive damageType and damageFlags
- Updated Instance.OnKnifeAttack to now receive attackType
- Updated Instance.TraceLine, Instance.TraceSphere and Instance.TraceBox
- The trace config now accepts an array of ignore entities or just one
- The trace config can specify to trace against hitboxes
- The trace result will include hitGroup if tracing against hitboxes
- Updated Instance.BulletTrace result to include hitGroup
- Updated Entity.TakeDamage to accept damageType and damageFlags
- Added CSWeaponData.GetGearSlot()