Core Stability Patch

STALKER 2 - Optimized Engine.ini | RAM & VRAM Leak Fixes + Performance

Overview

A hand-tuned Engine.ini focused on eliminating memory leaks, reducing stutters, and squeezing consistent performance out of mid-to-high end hardware. Every value has been researched and set with a specific reason — nothing is copy-pasted from generic UE5 tweak guides.

Built and tested on:

• []RTX 4070 Super (12GB VRAM)[/]

  []24GB DDR4 RAM[/]

  []AMD Ryzen 9 3900 (12c/24t)[/]

  []1080p Native | Windows 11[/]

What This Fix Addresses

STALKER 2 has several well-documented memory issues on PC. Over a long session, RAM and VRAM usage climbs steadily until the game stutters, hitches, or crashes. This config targets the root causes directly through Unreal Engine's exposed console variables.

Changes & Features

RAM Leak Fixes

• []Garbage collection interval reduced from ~60s to 20s — dead UObjects are purged more frequently, preventing RAM from accumulating stale data over time[/]

  []Incremental GC destroy spreads cleanup cost across frames so purge passes don't cause frame spikes[/]

  []Level streaming set to begin unloading non-visible levels at 65% RAM usage (~15. 6GB on a 24GB system), giving a safe buffer before the game hits its ceiling[/]

  []Lumen surface cache atlas capped at 512MB (default 1024MB) — prevents the Lumen lighting cache from leaking into RAM over extended sessions[/]

  []Lumen mesh SDF object tracking capped at 2000 entries[/]

  []Niagara particle emitter pool capped — default is unbounded and accumulates in RAM across combat-heavy areas[/]

• []Texture streaming pool hard-capped at 6GB with fixed pool size — no dynamic growth allowed, preventing VRAM creep[/]

  []GPU defrag active with controlled relocation budget to keep VRAM tidy without frame cost[/]

  []D3D12 zero buffer tuned to 8MB — balanced for 12GB VRAM cards, not over-allocated[/]

  []Hair strand shadow resolution reduced from 2048 to 256 — imperceptible at 1080p, saves significant VRAM[/]

• []IO dispatcher read cache set to 128MB — reduces repeated SSD/HDD reads when the same assets are streamed multiple times during open world traversal and level transitions[/]

  []PAK cache tuned for lower-level request batching and unreferenced block retention[/]

  []Async loading and streaming requests handled off the main thread[/]

[]All available cores used for rendering, shader compilation, animation, tick dispatch, and async cleanup[/]

[]Shadow cascade radius reduced from 8000 to 3000 — eliminates unnecessary per-object shadow calculations at distance[/]

[*]Preshadow resolution f