Understanding PC Bottlenecks

A bottleneck happens when one component in your PC limits the performance of the rest of the system.

Every gaming PC has some type of limiting factor depending on the game, resolution, graphics settings, and workload.

A bottleneck is not automatically a problem. It only becomes an issue when it prevents your system from reaching the performance you expect.

What Causes a Bottleneck?

A PC is made up of several components that work together.

Performance can be limited by:

  • CPU

  • GPU

  • RAM

  • Storage

  • Temperatures

  • Power limits

  • Background applications

  • Game engine limitations

The limiting component can change depending on what you are doing.

For example, one game may be CPU limited while another may be GPU limited on the exact same PC.

CPU Bottleneck

A CPU bottleneck happens when the processor cannot prepare frames quickly enough for the GPU.

Common signs include:

  • Lower GPU usage

  • High usage on one or more CPU cores

  • FPS not increasing much after lowering graphics settings

  • Poor 1% lows

  • Stuttering in busy areas

  • Lower FPS in competitive games

CPU bottlenecks are especially common when targeting very high FPS at lower resolutions.

GPU Bottleneck

A GPU bottleneck happens when the graphics card becomes the main component limiting frame production.

Common signs include:

  • GPU usage consistently near maximum

  • FPS increasing when graphics settings are lowered

  • Higher GPU temperatures and power usage

  • Performance decreasing significantly at higher resolutions

Being GPU limited is completely normal in many graphically demanding games.

High GPU usage does not automatically mean something is wrong.

RAM Bottleneck

RAM can limit performance if your system does not have enough available memory or if the memory configuration is inefficient.

Signs can include:

  • Stuttering

  • Poor 1% lows

  • Heavy page file usage

  • Slow multitasking

  • Games closing or crashing

  • Performance issues while other applications are open

RAM performance can also be affected by:

  • Memory speed

  • Memory latency

  • Single-channel configurations

  • XMP or EXPO not being enabled

Storage Bottleneck

Storage can also contribute to performance problems.

A slow or heavily utilized drive may cause:

  • Long loading times

  • Texture pop-in

  • Asset streaming stutters

  • Delayed game loading

  • System responsiveness issues

Modern games generally perform best when installed on an SSD.

Thermal Bottleneck

A thermal bottleneck occurs when a component becomes hot enough that it reduces its clock speed to protect itself.

This is known as thermal throttling.

Thermal throttling can cause:

  • FPS drops

  • Lower clock speeds

  • Stuttering

  • Reduced benchmark performance

  • Performance becoming worse over time

Monitoring CPU and GPU temperatures can help determine whether this is happening.

Power Bottleneck

Some systems can also become limited by power restrictions.

This is more common on:

  • Laptops

  • Prebuilt systems

  • Power-limited CPUs

  • Power-limited GPUs

A component may not reach its maximum performance if it is restricted by its configured power limits.

How to Identify Your Bottleneck

When testing performance, monitor:

  • CPU usage

  • Individual CPU core usage

  • GPU usage

  • RAM usage

  • CPU temperature

  • GPU temperature

  • Clock speeds

  • FPS

  • 1% lows

  • Frametime

Do not rely on one percentage alone.

For example, total CPU usage may only show 50%, but one CPU core may still be fully utilized and limiting the game.

Bottlenecks Change Between Games

There is no single bottleneck percentage that applies to every game.

Your system may be:

  • CPU limited in Valorant

  • GPU limited in Cyberpunk

  • RAM limited while heavily multitasking

  • Storage limited while loading assets

Resolution and settings also change the workload.

Lower resolutions and competitive settings tend to place more demand on the CPU.

Higher resolutions and graphical settings tend to place more demand on the GPU.

Is Bottlenecking Bad?

Not necessarily.

Every PC eventually becomes limited by something.

The goal is not to completely eliminate bottlenecks.

The goal is to make sure your hardware is balanced enough to provide the FPS, frametimes, responsiveness, and visual quality you expect.

Can EXM Remove a Bottleneck?

Software optimization cannot turn slower hardware into faster hardware.

However, EXM can help reduce unnecessary system overhead that may prevent your hardware from performing at its best.

Depending on your system, optimization can help with:

  • Background processes

  • Windows configuration

  • Power management

  • Input responsiveness

  • Game Mode

  • System consistency

  • Unnecessary resource usage

Results will vary depending on your hardware and the actual source of the bottleneck.

Need Help?

If you are unsure what is limiting your gaming performance, contact EXM Support with:

  • CPU

  • GPU

  • RAM

  • Resolution

  • Game

  • Graphics settings

  • Average FPS

  • 1% lows

  • CPU usage

  • GPU usage

  • Temperatures

This information helps our team identify what part of your system may be limiting performance.