System requirements

Official Kefir source Kefir help centre
MinimumRecommended
CPUIntel Core i5-6600K / AMD Ryzen 5 1600Intel Core i5-9600K / AMD Ryzen 5 3600
RAM12 GB16 GB
GPUGTX 1050 Ti / RX 580 / Arc A380RTX 2070 / RX 5700 XT / Arc B570
OSWindows 10 64-bit+Windows 10 64-bit+
DirectX1111
Storage20 GB20 GB

The game uses kernel-level Easy Anti-Cheat. A state holds up to 5,000 players, and the client keeps loading the city as you move, so the disk and memory matter more here than in a session shooter: an SSD and 16 GB of RAM remove most of the freezes on entering a district.

FPS drops when you move the mouse

This is the most common complaint, and it is not about the graphics card. Gaming mice report their position 1,000 times a second or more, and the game handles it poorly. Open the mouse software — Logitech, Razer, Bloody or another — and lower the polling rate from 1,000 to 500 Hz. Aiming does not suffer, the stutter disappears.

  1. Lower the mouse polling rate to 500 Hz or less.
  2. Update the graphics driver.
  3. On 13th and 14th generation Intel CPUs update the BIOS.
  4. Switch off overlays: Discord, GeForce Experience and the like.

Freezes, crashes and long loading

SymptomWhat to do
Game won't load / hangs on loadingCheck your connection; restart the game and Steam; update your GPU driver; verify file integrity (Steam → Properties → Installed Files → Verify)
Error E-0101 / E-0110Check your internet connection
Crashes / CTDClose background apps, reboot the PC; if it persists — contact support with PC specs, description and the error text
FPS drops when moving the mouseLower the mouse polling rate in the vendor software (Logitech/Razer/Bloody etc.), e.g. from 1000 to 500 Hz; update GPU driver; on Intel 13/14 gen update BIOS; disable overlays (Discord, GeForce Experience)
Easy Anti-Cheat errorScreenshot of the error + UID to support; close overlays; clean reboot; check antivirus; increase the paging file

If an error code is shown, look it up in the error table: there are 12 groups of codes, each with its own cause.

What to set in the game first

We do not list exact values for graphics options: they change with patches and depend on the hardware. The order is what matters. Lower what loads the processor and memory — draw distance, crowd and traffic density, shadows — before resolution and textures. In a city with thousands of players the processor is the bottleneck more often than the graphics card.

  1. Install the game on an SSD.
  2. Close the browser and other heavy programs before launch.
  3. If memory is short, increase the page file.
  4. Do not run the game through Remote Desktop: it gives a separate error.
  5. After changing settings, verify the game files in Steam if the game stops launching.

If nothing helps

  1. Copy your UID: Esc → UID to the right under the character name → Copy UID
  2. Gather evidence: what you were doing, screenshot/video, error text
  3. Submit via ROB RUN Help Center; for purchases attach the Steam receipt

Controller support is described in a separate answer.