The Comprehensive Guide On How To Run Stalker OGSR In The Most Efficient Die-Hard Manner

UPDATED ON: 2026-04-23

Some preface words: recently I’ve had a couple of attempts at trying to play Stalker 2.
When I realized that I can’t handle the game, I decided to give it a try by watching a let’s play.
After wasting almost 4 hours watching a let’s play from a trusted streamer,
I fully understand that playing or watching this game is beyond my comprehension.

Moreover, in a half an hour I realized that I completely and fully forgot about
the excellent Stalker: Shadow Of Chernobyl [OGSR modification] .
Previously, during the pandemic, I even made my personal
[music & audio addon] for the OGSR modification.

As you may already know, the OGSR mod brought substantial innovations to the original Stalker platform,
like a 64-bit engine, restored locations, loads of content, and a plethora of bugfixes.
Despite such enormous efforts from the loyal fan base community,
Stalker still struggles to run smoothly without any hiccups even on modern computers.

The game is notoriously known for bad performance even on powerful computers.
OGSR is not an exception here, despite being a relatively modern 64-bit port of the X-Ray 3D engine.

Here I will patch you up on how to make your game experience as smooth as possible
by applying all my technical computer related expertise, which I’ve acquired through the years.

Let me give you an example based on my personal configuration.
Currently I am running a 16-core/32-thread Ryzen 7950X loaded with 64GB of dual channel DDR5
memory and paired with a 24GB GeForce 3090Ti from EVGA.
The game runs on a Gen4 Samsung NVME 980 Pro.
I think that performance on such a machine should be perfect, but reality is quite a different thing to observe.

Yes, the game delivers almost permanent >60fps at 2560x1600 resolution on ULTRA preset with x2 antialiasing,
but when I am entering locations with a large number of NPCs and many things are happening,
the game stutters for 3-5 times and then restores smooth performance.

As a perfectionist in the past, I decided to eliminate this issue.
For God’s sake, a 20 year old game should run smoothly without any exceptions.
Of course I can’t fix the bugs and crashes which you will surely observe during gaming.
Even OGSR can’t fix all problems with engine stability.
This guide will describe the most extreme solution to the problem, so be ready for the wild stuff.

The first thing that came to my mind was to copy all the game to RAM,
since this can be done easily taking into account that the game occupies around 16GB of disk space.
A RAM disk can be created by means of [SoftPerfect RAM Disk 4.3.3] , the last version to support Windows 7.
I hope you didn’t forget that this website is dedicated to that operating system,
which is why I am sticking to compatible software.

Take a note, that storing game in RAM requires stable power delivery to your computer socket.
Also if for some reason you are getting F4 BSOD upon OS startup,
just load into the SafeMode and set RAM disk to HDD emulation mode,
around 20% slower, but it is still blazing fast comparing to any NVME/SSD drive.

The second thing to do is to make a FIXED swap file and move windows TEMP folder to the RAM drive also.

A fixed swap file does not spend CPU cycles as much as dynamic swap file allocation.
More importantly, move the entire SWAP file to the RAM disk as well.
Drive C: must have at least 16Mb of SWAP no matter how much RAM do you have,
[this is how windows works]. So my configuration having 64GB of RAM, is a fixed 88 Mb swap file
on the system drive C, and 888 Mb swap file on the RAM drive.

The third thing to do is to defragment the Stalker folder.
[Defraggler] is a nice piece of software that can optimize appointed folders.

Last, but definitely not least.
Here is a bunch of custom written scripts to optimize and automate the described procedures.

Copies Stalker to the RAM disk. Your destination and folder names may vary.
I am copying everything to drive letter S: [RAM drive].

c:
cd \
cd stalker
xcopy *.* S: /S /E /Y /Q /I /R /H

echo.
echo Copy of game completed successfully!
timeout /t 18

The most important script, which checks if xrEngine is in memory every 88 seconds.
When the game is unloaded from memory, the script safeguards game saves by transferring them to an NVME/SSD/HDD drive.

Obvious hit: you can apply this script/technique to any kind of game/software

@echo off
title Waiting for xrEngine.exe to unload...

s:
OGSE_Configurator.exe

echo.
echo Waiting for xrEngine.exe to be completely unloaded from memory...
echo (this script will check every 88 seconds)

:LOOP
tasklist /FI "IMAGENAME eq xrEngine.exe" 2>NUL | find /I "xrEngine.exe" >NUL
if %ERRORLEVEL% == 0 (
    timeout /t 88 /nobreak >NUL
    goto LOOP
)

echo.
echo xrEngine.exe is no longer running.
echo Starting copy from S:\_appdata_\savedgames\*.* to C:\STALKER\_appdata_\savedgames...


:: Copy all save files
xcopy "S:\_appdata_\savedgames\*.*" "C:\STALKER\_appdata_\savedgames\" /Y /Q /I /R /H

echo.
echo Copy of saves completed successfully!
timeout /t 18

The actual game launcher, which does some cleanups before starting the game.
Unload all unneeded stuff from system memory.
Sometimes applications have a tendency to stick in memory forever without any reason.
Below you will see two methods of unloading applications; if one is not working, there is a second as a backup.

taskkill /F /IM "xnviewmp.exe"
taskkill /F /IM "CaptureOne.exe"
taskkill /F /IM "ImgCoreProcess.exe"
taskkill /F /IM "CODiagnosticsService.exe"
taskkill /F /IM "Xpiks.exe"
taskkill /F /IM "photo.exe"
taskkill /F /IM "Topaz DeNoise AI.exe"
taskkill /F /IM "PhotomatixPro.exe"
taskkill /F /IM "vegas210.exe"
taskkill /F /IM "ErrorReportLauncher.exe"
taskkill /F /IM "rawtherapee.exe"
taskkill /F /IM "FileZilla Server Interface.exe"
taskkill /F /IM "FileZilla Server.exe"
taskkill /F /IM "ArsClip.exe"
taskkill /F /IM "foobar2000.exe"
taskkill /F /IM "Far.exe"
taskkill /F /IM "hasplms.exe"
taskkill /F /IM "hddled.exe"
taskkill /F /IM "httpd.exe"
taskkill /F /IM "mega-desktop-app-gfxworker.exe"
taskkill /F /IM "postgres.exe"
taskkill /F /IM "r3dfox.exe"
taskkill /F /IM "timeserv.exe"
taskkill /F /IM "Workrave.exe"
taskkill /F /IM "WorkraveHelper.exe"
taskkill /F /IM "LvAgent.exe"
taskkill /F /IM "LvAgent64.exe"
taskkill /F /IM "notepad++.exe"
taskkill /F /IM "MEGAsync.exe"
taskkill /F /IM "nextcloud.exe"

wmic process where name="xnviewmp.exe" call terminate
wmic process where name="CaptureOne.exe" call terminate
wmic process where name="ImgCoreProcess.exe" call terminate
wmic process where name="CODiagnosticsService.exe" call terminate
wmic process where name="Xpiks.exe" call terminate
wmic process where name="photo.exe" call terminate
wmic process where name="Topaz DeNoise AI.exe" call terminate
wmic process where name="PhotomatixPro.exe" call terminate
wmic process where name="vegas210.exe" call terminate
wmic process where name="ErrorReportLauncher.exe" call terminate
wmic process where name="filezilla.exe" call terminate
wmic process where name="rawtherapee.exe" call terminate
wmic process where name="FileZilla Server Interface.exe" call terminate
wmic process where name="FileZilla Server.exe" call terminate
wmic process where name="ArsClip.exe" call terminate
wmic process where name="foobar2000.exe" call terminate
wmic process where name="Far.exe" call terminate
wmic process where name="hasplms.exe" call terminate
wmic process where name="hddled.exe" call terminate
wmic process where name="httpd.exe" call terminate
wmic process where name="mega-desktop-app-gfxworker.exe" call terminate
wmic process where name="postgres.exe" call terminate
wmic process where name="r3dfox.exe" call terminate
wmic process where name="timeserv.exe" call terminate
wmic process where name="Workrave.exe" call terminate
wmic process where name="WorkraveHelper.exe" call terminate
wmic process where name="LvAgent.exe" call terminate
wmic process where name="LvAgent64.exe" call terminate
wmic process where name="notepad++.exe" call terminate
wmic process where name="nextcloud.exe" call terminate
wmic process where name="MEGAsync.exe" call terminate

netsh interface set interface name="Local Area Connection" admin=disabled

c:
cd /
cd STALKER
C:\STALKER\OGSE_Configurator.exe

Netsh line disables the network connection, because you don’t need it while playing Stalker.
You can enable network interface later.

netsh interface set interface name="Local Area Connection" admin=enabled

@echo off
title Waiting for xrEngine.exe to unload...

c:
cd \
cd stalker
xcopy *.* S: /S /E /Y /Q /I /R /H

echo.
echo Copy of game completed successfully!

taskkill /F /IM "xnviewmp.exe"
taskkill /F /IM "Xpiks.exe"
taskkill /F /IM "photo.exe"
taskkill /F /IM "Topaz DeNoise AI.exe"
taskkill /F /IM "vegas210.exe"
taskkill /F /IM "ErrorReportLauncher.exe"
taskkill /F /IM "rawtherapee.exe"
taskkill /F /IM "FileZilla Server Interface.exe"
taskkill /F /IM "FileZilla Server.exe"
taskkill /F /IM "ArsClip.exe"
taskkill /F /IM "foobar2000.exe"
taskkill /F /IM "Far.exe"
taskkill /F /IM "hasplms.exe"
taskkill /F /IM "hddled.exe"
taskkill /F /IM "httpd.exe"
taskkill /F /IM "mega-desktop-app-gfxworker.exe"
taskkill /F /IM "postgres.exe"
taskkill /F /IM "r3dfox.exe"
taskkill /F /IM "timeserv.exe"
taskkill /F /IM "Workrave.exe"
taskkill /F /IM "WorkraveHelper.exe"
taskkill /F /IM "LvAgent.exe"
taskkill /F /IM "LvAgent64.exe"
taskkill /F /IM "notepad++.exe"
taskkill /F /IM "MEGAsync.exe"
taskkill /F /IM "nextcloud.exe"

wmic process where name="xnviewmp.exe" call terminate
wmic process where name="Xpiks.exe" call terminate
wmic process where name="photo.exe" call terminate
wmic process where name="Topaz DeNoise AI.exe" call terminate
wmic process where name="vegas210.exe" call terminate
wmic process where name="ErrorReportLauncher.exe" call terminate
wmic process where name="filezilla.exe" call terminate
wmic process where name="rawtherapee.exe" call terminate
wmic process where name="FileZilla Server Interface.exe" call terminate
wmic process where name="FileZilla Server.exe" call terminate
wmic process where name="ArsClip.exe" call terminate
wmic process where name="foobar2000.exe" call terminate
wmic process where name="Far.exe" call terminate
wmic process where name="hasplms.exe" call terminate
wmic process where name="hddled.exe" call terminate
wmic process where name="httpd.exe" call terminate
wmic process where name="mega-desktop-app-gfxworker.exe" call terminate
wmic process where name="postgres.exe" call terminate
wmic process where name="r3dfox.exe" call terminate
wmic process where name="timeserv.exe" call terminate
wmic process where name="Workrave.exe" call terminate
wmic process where name="WorkraveHelper.exe" call terminate
wmic process where name="LvAgent.exe" call terminate
wmic process where name="LvAgent64.exe" call terminate
wmic process where name="notepad++.exe" call terminate
wmic process where name="nextcloud.exe" call terminate
wmic process where name="MEGAsync.exe" call terminate

netsh interface set interface name="Local Area Connection" admin=disabled

s:
cd bin_x64
xrEngine.exe

echo.
echo Waiting for xrEngine.exe to be completely unloaded from memory...
echo (this script will check every 88 seconds)

:LOOP
tasklist /FI "IMAGENAME eq xrEngine.exe" 2>NUL | find /I "xrEngine.exe" >NUL
if %ERRORLEVEL% == 0 (
    timeout /t 88 /nobreak >NUL
    goto LOOP
)

echo.
echo xrEngine.exe is no longer running.
echo Starting copy from S:\_appdata_\savedgames\*.* to C:\STALKER\_appdata_\savedgames...


:: Copy all save files
xcopy "S:\_appdata_\savedgames\*.*" "C:\STALKER\_appdata_\savedgames\" /Y /Q /I /R /H

echo.
echo Copy of saves completed successfully!
timeout /t 18

The provided batch files can be executed by means of hotkeys.
You can assign scripts to hotkeys using the native Windows shortcut system.
For convenience I am using a hardware joypad in conjunction with [Joy2Key] application.
I prefer to hit keys not on the keyboard, but on the dedicated device instead.

FINAL RESULT

The game stutters from 3-5 times on heavy locations decreased to 1 time.
I think that it is quite a nice achievement, to say the least.

Bonus part I: For those of you who would like a quality walkthrough with the analog warmth of Stalker OGSR,
I can suggest the [Stalker Vision] channel. The only problem is that it is in Russian,
but at least you can take a visual hint if you get stuck somewhere for some reason.

Bonus part II: I also have a plan to move the temporary Windows folder to Optane RAID0 16Gb.
Optane is well-known due to its extremely good random 4K access time and ultra low latency,
successfully competing with modern Gen5 NVME drives.
The RAID0 idea improves performance to even more extreme levels.
You may ask why not to put the temp folder into RAM as a SWAP file?
The answer is expectedly trivial:
I have a desire to separate tasks for even better scheduling and performance,
to finally reach the boundaries of existence!

Bonus part III: If you are running the Aero interface in Windows 7, some time after the game starts,
you will be returned to the desktop to see the annoying message
“Do you want to change the color scheme…”
The safe way to remove this is to use Registry Editor.

• HKEY_CURRENT_USER\Software\Microsoft\Windows\DWM
• Create a new DWORD (32-bit) Value named UseMachineCheck and set its value to 0
• Restart your computer

If mentioned solution didn’t help you, you can try extreme option to directly hex-edit DWM.exe

Please, take a note that you must make a backup of modified files before proceeding!

1. Stop Desktop Window Manager Session Manager in services.msc
2. Navigate to C:\Windows\System32
3. Right-click dwm.exe, select Properties, then go to the Security tab
4. Click Advanced, then go to the Owner tab
   Click Edit…, select your username,
   check “Replace owner on subcontainers and objects”
   click [OK]
   This gives you permission to modify the file.
5. Right-click dwm.exe again, go to Properties > Security
   Click Edit…, select your username, and check the Full control box under “Allow”
   Click [OK]
6. Install any free HEX EDITOR and run it as an Administrator
7. Open dwm.exe in hex editor & search for the following pattern
8. In Hex editor, ensure the overwrite mode is on (so it doesn’t change the file size)

Here we are talking about updated Windows 7 SP1 x64 + KB3125574 Convenience Rollup installation.

• Search for Hex: FF1562B1000085C079
• Replace with Hex: 9090909090909090EB
• Original File MD5: c206c9dbfc34afd367dd150d979a5185

9. Restart Desktop Window Manager Session Manager in services.msc

Uff, think the guide has finally reached its logical end, and it was a really long one!
Frankly speaking, I didn’t imagine that a small note would end up as such a massive article.

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