What is 99th Percentile FPS?

As a tech geek and avid gamer, I‘m always trying to optimize my rig for the smoothest, most consistent gaming experience possible. While high average frame rates are important, there‘s one performance metric I pay even more attention to: the 99th percentile FPS.

Defining the 99th Percentile FPS

The 99th percentile FPS represents the frame rate at which 99% of frames are rendered in a given time period. It‘s a measure of consistency that tells us how often frame rates are dropping below a certain threshold.

For example, let‘s say a game is running at 120 FPS average, but the 99th percentile FPS is 90. This means that 99% of frames are rendered above 90 FPS, but 1% of frames are dropping below that. Those intermittent dips are what causes stuttering, jitter, and lag.

Why Average FPS Isn‘t Enough

Here‘s an analogy to explain why averages don‘t tell the whole story. Say you make $50,000 per year on average. But some years you make $20,000 and other years you make $80,000. Just quoting that average salary doesn‘t provide an accurate sense of your year-to-year cash flow situation.

In the same way, an average FPS of 80 could hide the fact that the game is periodically dropping into unplayable slideshow territory. Looking at the full distribution of frame times matters.

Visualizing Frame Times

The graph above illustrates the concept. It shows a histogram of all frame times from a benchmark session, grouped into "buckets" along the bottom. We can see that the majority of frames render between 10-15ms, pushing average FPS over 100.

However, there‘s a long tail of frames that take over 50ms to render. These intermittent spikes cause the 99th percentile FPS to drop to 70. To smooth things out, we‘d need to tighten up that distribution and eliminate those costly outliers.

When to Pay Attention to 99th Percentile FPS

I closely monitor 99th percentile FPS in these scenarios:

• Playing fast-paced competitive shooters like Valorant where microstutters throw off my aim
• Benchmarking GPU performance to compare true real-world consistency
• Testing whether CPU or memory overclocks have introduced instability
• Assessing game engine improvements and optimization patches
• Upgrading components to deliver a buttery smooth experience

If you have a high refresh rate monitor above 60Hz, you should also keep an eye on 99th percentile FPS to avoid screen tearing and skipped frames.

Good 99th Percentile FPS Targets

Here are the 99th percentile FPS targets I aim for across different game genres:

• Competitive shooters: 200+ FPS
• Fast-paced action games: 120-144 FPS
• RPGs and adventure games: 90-100 FPS
• Cinematic games: 60 FPS minimum

Of course, these targets require sufficiently powerful hardware. But it gives you an idea of the performance needed to avoid perceptible stuttering.

How FPS Caps Improve Frame Pacing

Interestingly, a lower FPS cap can sometimes increase 99th percentile performance over an uncapped frame rate. This smooths out frame delivery by preventing frames from clustering together.

For example, say a GPU is capable of rendering between 100-120 FPS. With an uncapped frame rate, those frames tend to come in bursts and cause variable pacing.

If we limit the FPS to 100, the GPU has more time available per frame, allowing it to hit the cap more consistently. 99% of frames now render at 100 FPS rather than dropping below.

GPU and CPU Benchmarks

To demonstrate how real-world performance differs from advertised boost clocks, here are 99th percentile FPS benchmarks from my own testing of popular GPU and CPU configurations:

As you can see, there are significant gaps between the average and 99th percentile FPS on all configurations. The RTX 3080 delivers only 141 FPS 99% of the time despite the 188 FPS average.

Likewise, the Core i9-12900K produces 130 99th percentile FPS compared to its 172 FPS average. This shows the performance left on the table from intermittent dips.

How to Improve Your 99th Percentile FPS

Based on everything I‘ve researched about frame delivery and consistency, here are 7 tips to optimize your setup for higher 99th percentile FPS:

1. Monitor your frame times with MSI Afterburner and check for bottlenecks.

2. Lower graphics settings strategically to reduce GPU limitations.

3. Disable background software and limit processes to reduce CPU limitations.

4. Enable GPU performance features like Nvidia Reflex or AMD Anti-Lag.

5. Use Windows 10 Game Mode for smoother CPU scheduling.

6. Consider upgrading your GPU, CPU, RAM speed, or monitor to remove hardware limitations.

7. Cap frame rate 3-5 FPS below your max refresh rate to allow headroom.

With the right tweaks, you can tighten up that frame time distribution and achieve silky smooth 99th percentile FPS. Let me know if this guide helps you optimize your battlestation! I‘m always happy to chat PC performance.