The Effects of FPS Limiters on Gaming Performance: An Informative Guide

In today’s PC gaming landscape, framerates, frametimes, and system latency are crucial metrics that significantly influence gameplay smoothness and responsiveness. While gamers often focus on average FPS, those with experience understand that consistent frame pacing and low system latency can enhance the overall experience more than just chasing a high FPS figure.

This is where framerate limiters come into play. These advanced algorithms restrict the number of frames a GPU processes each second while carefully managing various trade-offs. At first glance, it may seem counterproductive to limit performance—what’s the point of capping FPS? The reality is that uncapped framerates can lead to overworked CPUs and GPUs, resulting in excessive heat, noisy cooling fans, inconsistent frametime delivery, and distracting screen tearing. A well-implemented framerate cap can alleviate these issues, allowing for smoother gameplay, steady frame delivery, and sometimes improved responsiveness.

Framerate limiting isn’t universally applicable; it varies across implementations, whether native to games, embedded in graphics drivers, or provided by third-party tools. Each method presents unique implications for performance stability and system latency, defined as the time between an input command and its on-screen response. For gamers looking to optimize their gameplay beyond mere FPS numbers, understanding these nuances is essential.

This article delves into framerate limiters through CapFrameX, a modern benchmarking tool capable of measuring multiple performance metrics. We will focus on four specific metrics: average FPS for raw performance, 1%/0.1% low average FPS for frametime consistency, and average PC latency to assess system latency. We will utilize a contemporary, well-optimized title: Cyberpunk 2077, to benchmark various FPS limiter implementations, including vertical sync (VSync), in-game limiters, NVIDIA graphics driver limiters, NVIDIA Reflex Low Latency settings, RivaTuner Statistics Server (RTSS) limiters, and the advanced Special K limiter. Our approach aims to standardize testing methodologies and performance metrics, ultimately revealing how these limiters affect real-world gameplay smoothness and responsiveness.

This guide aims to assist you in determining which framerate limiters deliver the best balance of performance for your specific gaming setup.

In-Depth Look at Framerate Limiters

Framerate limiters encompass diverse tools that cap framerates and adjust how your PC hardware engages with a game’s rendering pipeline. Each interacts with game engines differently, leading to various trade-offs in terms of smoothness, input latency, and visual quality. Below, we break down the limiters we’ll explore in a Cyberpunk 2077 benchmark.

Vertical Synchronization (VSync)

Definition: VSync, or vertical synchronization, is an age-old synchronization technique that aligns the frame presentation rate of a game with your display’s refresh rate. Its primary goal is to eliminate screen tearing, which occurs when a new frame displays before the previous one has fully rendered. By making the GPU wait for the next refresh cycle to present a frame, VSync helps mitigate visual disruptions.

Impact on Performance:

• No screen tearing: VSync effectively synchronizes the GPU frame output with the display refresh rate.
• Increased input latency: The delay introduced between frame readiness and presentation can lead to noticeable input lag.
• Stuttering at low FPS: If framerates fall below the monitor’s refresh rate, VSync can lead to inconsistent frame pacing and stutters.

When to Use: VSync is often beneficial in single-player or cinematic scenarios where tearing is disruptive and input latency is less critical. In setups with variable refresh rates (like AMD FreeSync or NVIDIA G-SYNC), VSync can help minimize tearing in cases where framerate exceeds the VRR range. The latency penalty may also be mitigated when combined with optimal FPS limiting strategies like NVIDIA Reflex Low Latency.

Pros and Cons:

• Pros: Effectively reduces screen tearing, offering a calm viewing experience.
• Cons: Can introduce significant input lag and stuttering if framerates dip below refresh rates; caps frame output, which may hamper performance in competitive games.

In-Game Framerate Limiter

Definition: Many modern games feature native framerate capping options within their engines, which stop frame rendering above a specific target. This cap minimizes system workload and avoids excessive unnecessary frames.

Operational Mechanism: Unlike VSync, an in-game FPS limiter initiates the next frame only after the current frame is fully rendered, ensuring smoother frame pacing without the latency that display synchronization may cause.

Pros and Cons:

• Pros: Generally lower latency than driver or external caps, conveniently integrated into the game engine.
• Cons: Performance quality and accuracy may vary based on the specific game engine.

NVIDIA Graphics Driver Framerate Limiter

Definition: This option, known as “Max Frame Rate“within the NVIDIA Control Panel, is part of the GPU driver and can be applied globally or on a per-application basis.

Operational Mechanism: The driver intercepts rendering calls made by the game engine, imposing a cap on framerate. It’s typically low-latency and accurate for most scenarios, although older driver versions had issues with smooth pacing compared to third-party options.

Pros and Cons:

• Pros: Simple to apply without the need for extra tools; often has minimal overhead.
• Cons: May not deliver as consistently smooth frametimes in all situations compared to RTSS.

NVIDIA Reflex Low Latency

Definition: NVIDIA Reflex Low Latency technology is designed for NVIDIA GPUs from the “Maxwell”GTX 900 series onward to significantly reduce system latency and input lag in games. It enhances responsiveness, especially in competitive settings, by synchronizing GPU and CPU workloads and minimizing the render queue.

Operational Mechanism: Reflex integrates with the game engine (when supported) to ensure rendering occurs just in time for display, reducing both render queue delays and CPU pressure during intensive GPU scenes. This effectively lowers the time between input and visible response, leading to reduced PC Latency, which combines game latency and GPU rendering delays.

The FPS cap applied when using Reflex in conjunction with VSync and G-Sync is derived from community-agreed formulas. For common display refresh rates, typical caps include:

Pros and Cons:

• Pros: Drastically reduces system latency compared to traditional caps; optimized for gaming responsiveness.
• Cons: Limited to games that support it; effectiveness can vary based on game engine and GPU workload; potential frametime instability can occur, affecting visual smoothness.

RivaTuner Statistics Server (RTSS) FPS Limiters (Async, Front Edge Sync, Back Edge Sync)

Overview: Developed by Alexey Nicolaychuk (known as Unwinder), RTSS is a third-party tool that excels at capping game framerates outside of the game engine while also providing performance overlay features. It offers several limiting modes to manage frame pacing, including:

Async (Asynchronous): The default mode adds a buffer to ensure flat frametimes and visually smooth output but may introduce latency when VSync is enabled.

Front Edge Sync / Back Edge Sync: These modes synchronize frame presentation with the vertical blanking interval, improving timing precision without significantly impacting latency, effectively balancing smoothness and responsiveness.

RTSS With NVIDIA Reflex: Newer versions of RTSS can utilize Reflex’s low-latency FPS limiting tactics, reducing traditional buffering latency while still capping framerates.

Pros and Cons:

• Pros: Highly precise framerate capping; offers a variety of configuration options to enhance user experience.
• Cons: Async mode can increase latency; multiple limiter modes may confuse users; effectiveness varies by game.

Special K FPS Limiter

Definition: Special K is a comprehensive performance enhancement framework created by modder Kaldaien. Beyond FPS capping, it offers a range of game tweaks and advanced graphics options.

Operational Mechanism: Instead of simply delaying frames, Special K intercepts rendering calls both before and after the ‘Present’ command, optimizing rendering time for a smoother experience. It can inject Reflex Low Latency markers into compatible games, allowing for measurement of PC Latency.

Special K incorporates four framerate limiting modes, each with distinct latency and frame pacing results:

• Normal Mode: Optimized for minimal stuttering.
• Low-Latency Mode: Designed for displays supporting VRR, trading frame stability for reduced latency.
• Latent Sync Mode: For fixed-refresh-rate displays lacking VRR support.
• NVIDIA Reflex Mode: Mimics Reflex Low Latency functionality, ideal for VRR and DLSS-enabled scenarios.

Pros and Cons:

• Pros: Provides highly stable and smooth output; offers advanced tuning options for frame presentation.
• Cons: Requires meticulous configuration per game; may not be as user-friendly as built-in limiters.

Testing Methodology

To ensure the benchmarking outcomes are precise and replicable, we standardized both our hardware and software setups as well as the performance metrics collected. The tests were conducted on the following system:

• CPU: Intel Core i7-14700K
• RAM: 32 GB DDR5-7000 CL34
• Storage: 2 TB PCIe 4.0 NVMe SSD
• GPU: NVIDIA GeForce RTX 4090
• Operating System: Windows 11 25H2
• All firmware, driver, and OS updates were applied before testing.

We utilized the latest version of CapFrameX to capture raw frametime data during controlled testing of Cyberpunk 2077. The test scenario involved a standardized path while riding a bike through identical areas to keep the rendering load and in-game events as consistent as possible. Each test leveraged CapFrameX’s run history feature to record three independent runs and eliminate variability.

We targeted a 120 FPS cap for all framerate limiter benchmarks with the display’s refresh rate set at 120 Hz.

Average FPS

Average Frames Per Second (FPS) represents the total rendered frames divided by the capture time, offering an approximate measure of overall game performance during the benchmark. However, average FPS can be misleading, as it fails to account for performance dips and the consistency of frame delivery.

1% Low Average FPS

1% low average FPS indicates the average framerate of the slowest 1% of captured frames. This metric demonstrates the “worst sustained performance, ”highlighting how much framerate drops during demanding scenes. Higher values generally suggest smoother gameplay with fewer noticeable stutters.

0.1% Low Average FPS

The 0.1% low average FPS focuses on the slowest 0.1% of frames captured, showing extreme but rare performance dips that players usually notice as stutters or hitches. Tracking this ensures that we capture significant disruptive drops during intense moments.

Average PC Latency

Average PC Latency refers to the time in milliseconds from the moment a frame begins rendering to when it is queued for display, reflecting the internal latency of the system. This metric is crucial for latency-sensitive environments like competitive gaming, where input responsiveness is key.

Adaptive Standard Deviation (Adaptive STDDEV)

Adaptive STDDEV is a unique statistical measure utilized by CapFrameX to evaluate the variance of instantaneous performance values over a moving time average. Lower Adaptive STDDEV values signify more consistent frame delivery, fostering smoother gameplay experiences. Essentially, this metric reflects the “jumpy” feel of performance—lower values indicate smoother running, while higher values signify noticeable irregularities in frame timing.

Test Scene and Repeatability

For each limiter configuration, we conducted CapFrameX captures across identical passing sequences in Cyberpunk 2077. This method ensures dynamic streaming of assets simulating real-world gameplay rather than relying on static benchmarks. All game settings and resolutions remained constant across runs, guaranteeing fair comparisons.

By leveraging CapFrameX’s run history averaging across three runs, we reduced anomalies resulting from background processes and transient hiccups, providing a more statistically representative view of each limiter’s performance.

This methodology guarantees that our results are accurate and reflective of practical gameplay under varying FPS capping approaches, offering valuable insights into performance trade-offs concerning speed, smoothness, and responsiveness.

Frametimes versus Display Times

Another critical detail in our benchmarking is that all our percentile-based FPS metrics—such as 1% lows, 0.1% lows, and Adaptive STDDEV—are based on actual display times, measured through CapFrameX’s msBetweenDisplayChange feature. This means our assessments focus on the intervals between frames as they appear on screen, providing a more accurate representation of the player experience rather than simply timing when the game engine dispatches frames. This approach results in more pertinent measurements of smoothness and stutter, especially when evaluating FPS limiters’ effectiveness.

Results and Analysis

In this section, we present objective benchmark results from our testing of the Cyberpunk 2077 sequences using CapFrameX. Each screenshot includes key performance metrics—Average FPS, 1% and 0.1% Low Average FPS, Average PC Latency, and Adaptive STDDEV—to allow for a clear visual comparison of different limiters in the same gameplay context. Our analysis will reveal the distinct characteristics exhibited by each framerate limiter concerning smoothness, latency, and screen tearing.

In the upcoming captures, frametimes indicating visual smoothness at the hardware level are shown in blue, while display times pertaining to visual experience are marked in green.

• VSync Limiter:

VSync provides the smoothest display times; however, this comes with a significant increase in average latency. We recommend this limiter for single-player scenarios where responsiveness is less critical.

• In-Game Limiter:

This limiter produced smooth display times with low average latency but led to noticeable screen tearing, especially if not capped below the monitor’s maximum refresh rate. This option is ideal for casual gamers seeking a straightforward framerate limiting solution.

• NVIDIA Graphics Driver Limiter:

The NVIDIA driver also provides smooth display times with relatively low latency, though slightly less stable than the in-game limiter. Ideal for casual users wanting a low-maintenance global framerate cap.

• NVIDIA Reflex Low Latency + VSync/G-Sync Limiter:

• RTSS Async Limiter:

The RTSS Async limiter provides excellent smoothness and low latency, making it a phenomenal choice for enthusiasts in both single-player and competitive scenarios, especially when the cap is set below the monitor’s refresh rate.

• RTSS Front Edge Sync Limiter:

This limiter shows promise with smooth display times but exhibits some erratic frametimes. We recommend experimenting with this option to assess any tangible performance benefits.

• RTSS Back Edge Sync Limiter:

Similar behavior and recommendations as the RTSS Front Edge Sync limiter.

• Special K Normal Limiter:

This mode offers very smooth display times with acceptably low latency, making it great for tech-savvy players seeking the best output. However, it’s recommended not to use Special K in online games due to potential anti-cheat flags on its hooking method.

• Special K Low-Latency Limiter:

This limiter struggled with display time smoothness but had low average latency, advising advanced users to test it in single-player games without any integrated latency reduction tech.

• Special K Latent Sync Limiter:

This limiter displayed low adaptive STDDEV and average latency but did show some screen tearing, work best for single-player on fixed refresh-rate displays with a cap set slightly below maximum.

As evidenced by our Cyberpunk 2077 tests, each framerate limiting method resulted in varying degrees of smoothness and latency. Ultimately, no single limiter stands out as perfect; some prioritize either tight consistency or responsiveness based on user preferences.

Below is a concise summary of our findings:

Concluding Remarks

Our exploration of various framerate limiting methods within Cyberpunk 2077 using CapFrameX highlighted the unique trade-offs associated with each option. Tools like RTSS and Special K frequently deliver excellent frame consistency, as evidenced by their low STDDEV values. However, this can often lead to a slight increase in overall latency due to internal buffering processes. Conversely, simpler solutions like in-game limiters or NVIDIA’s Max Frame Rate setting yield lower latency with commendable stability, albeit without the same optimal frametime delivery.

VSync, when utilized independently, can add substantial latency, turning it into a less suitable choice unless paired with additional framerate caps or adaptive sync solutions. Conversely, NVIDIA Reflex Low Latency shines as a standout alternative—rather than enforcing a hard limit, it dynamically controls frame submission, often reducing latency while keeping effective framerates just shy of the refresh boundary.

Consequently, for gamers aiming for the lowest input lag on robust hardware, Reflex Low Latency is typically the recommended daily choice. For those prioritizing visual smoothness and consistent framing, exploring RTSS or Special K is worthwhile despite the added configuration complexity. For users lacking adaptive sync/VRR support, choosing a suitable frame cap just below the monitor’s refresh rate will help achieve a satisfactory balance of smoothness, low latency, and minimal tearing. Ultimately, the “best” limiter is contingent on your gameplay priorities—whether it’s low latency for competition or tight consistency for enriched visual experience.

Source & Images

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