FPS Drop and Stutter Cause Checker

Common causes of FPS drops and stutter

Pick your symptoms above and the checker narrows these down and shows how to check and fix each one.

Hardware limits

• Graphics card limit

  The graphics card is working flat out and still cannot deliver more frames. Above 96% GPU utilization, the graphics card sets your frame rate.

• CPU limit

  The graphics card sits idle while it waits for the CPU to prepare the next frame.

• Not enough video memory (VRAM)

  Texture quality uses a lot of video memory. When it runs short you can get periodic stutter or late-loading textures, and lowering texture quality smooths things out.

• Low RAM or single channelPossible

  When a game needs more memory than you have, Windows moves some of it to disk, which is slower than RAM and can cause stutter. With only one memory stick installed, bandwidth is lower than in dual channel.

• Game installed on a hard drive (HDD)

  Games keep reading data from disk while you play. Hard drives are slow and can hitch when you enter new areas, and an SSD can reduce stutter.

Settings and drivers

• Frame rate cap or V-Sync

  A frame rate cap or V-Sync stops FPS at a set number. V-Sync causes stutter and input lag whenever the frame rate falls below the refresh rate.

• Monitor set to 60Hz

  Even a high refresh rate monitor such as 144Hz only updates 60 times a second if Windows is set to 60Hz.

  Monitor Refresh Rate Test

• Game running on integrated graphics

  Laptops default to integrated graphics to save battery, and a game left there runs far slower. On desktops, a monitor cable in the motherboard port can do the same.

• Heat throttling

  CPUs and graphics cards lower their own clocks and power as they approach their temperature limit. If performance is fine at first and drops over time, this is the first thing to suspect.

• Shader compilation

  A common cause of stutter: the game pauses briefly while compiling shaders during play. Compiled shaders are cached so it eases next time, and a new driver clears that cache.

• Second monitorPossible

  Many people report game stutter when mixing monitors with different refresh rates or playing video on a second monitor. It isn't a confirmed cause, so compare it yourself.

• Graphics driver

  Problems that start after a Windows Update are often fixed by going back to the previous driver. Lower performance in some games after the October 2025 Windows 11 update was also fixed with an NVIDIA driver.

• High mouse polling ratePossible

  A mouse with a very high polling rate makes the CPU process that many more inputs, which can cause stutter when the CPU is busy.

  Mouse Polling Rate Test

Windows and background apps

• Power mode or laptop battery

  If the Windows power mode leans toward efficiency, it saves battery rather than maximizing performance. Laptops keep separate values for plugged in and on battery.

• Discord overlay and Clips

  Discord's game overlay can be behind lag or crashes in a game, and on lower-end PCs Clips can affect game performance too.

• Background recording

  Xbox Game Bar background recording keeps using PC resources and can affect game performance. Higher recording quality and frame rate add to the load.

• Background programs

  Programs, browser tabs and updates running alongside the game share the CPU, memory and disk. The more you keep open, the more performance can drop.

• Fullscreen optimizations and windowed modePossible

  Windows runs fullscreen games like an optimized window, and handles windowed games with 'Optimizations for windowed games'. Many people link these to stutter after alt-tabbing, but that isn't a confirmed cause.

• Memory integrity (core isolation)Possible

  A security feature that protects the Windows kernel from malware; it costs more performance on CPUs older than Intel 7th gen or AMD Zen 2. From October 2026, Windows updates start turning it on for eligible PCs, so a drop after an update may come from this.

• Hardware-accelerated GPU schedulingPossible

  A Windows setting that lets the graphics card handle GPU scheduling. Some report stutter after switching it, but that isn't a confirmed cause, and DLSS Frame Generation on RTX 40 and 50 series needs it on.