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B- Fps Limiter

by RobertRoss_VFX·Workflow

Images © RobertRoss_VFX. Used for product review; image policy.

Why we like it

B- FPS Limiter earns its place for a narrow, practical job: throttling Blender's viewport so mobile and passively cooled machines run cooler and quieter. The draw-handler approach and safety clamp show attention to keeping the interface responsive even at low frame caps.

What is B- Fps Limiter?

B- FPS Limiter is a Blender add-on that caps the 3D viewport frame rate. Blender's viewport runs unthrottled, so on a high-refresh external monitor it renders every viewport rotation at maximum FPS. This add-on injects a throttle directly into Blender's draw loop, giving your hardware a micro-rest between frames. Capping the viewport to 25 FPS or a custom limit reduces the load on the GPU and CPU.

Rather than a simple timer, a draw-handler solution calculates the exact time elapsed per frame and throttles only what is necessary. A built-in safety clamp keeps Blender's UI responsive so it never locks up, no matter how low you set the frame rate. The add-on uses a thread-sleeping mechanism to reduce power draw, and is built entirely on Blender's WindowManager, so it saves no data inside your .blend files.

Controls live in a dedicated N-Panel tab in the 3D Viewport sidebar, where you toggle the limiter and adjust target FPS. Global Startup Preferences let you set a default state and frame rate that persist across restarts.

Who is B- Fps Limiter best for?

B- Fps Limiter is best for laptop and ultrabook users, including passively cooled machines like the MacBook Air and gaming laptops prone to fan noise, plus artists working on external 144Hz+ monitors who want to save computing power for rendering rather than viewport navigation.

How much does B- Fps Limiter cost?

B- Fps Limiter is completely free to download and use.

Key features

  • Dedicated N-Panel tab in the 3D Viewport sidebar to toggle the limiter on or off and adjust the target FPS
  • Global Startup Preferences in Blender Preferences that set a default state and target frame rate and persist across restarts
  • Draw-handler frame capping that calculates the exact time elapsed per frame and throttles only what is necessary
  • Built-in safety clamp that keeps Blender's UI responsive and prevents lock-ups at low frame rates
  • Thread-sleeping mechanism that lowers power draw when full FPS isn't needed
  • Built entirely on Blender's WindowManager, saving no data inside .blend project files

Tags

#fps#viewport#performance#laptop#cooling#battery#blender#add-on

Frequently asked questions

Does B- FPS Limiter work with Blender 4.2?

B- FPS Limiter supports Blender versions 4.2 through 5.1 and is marked as Blender Extension compatible, distributed as an add-on with Cycles noted as the render engine used. Within that version range you can install it and reach its controls from the 3D Viewport sidebar. If you run a Blender release outside 4.2 to 5.1, check the developer's page to confirm support before installing, since that range defines where the add-on is documented to run.

What frame rate does B- FPS Limiter cap the viewport to?

B- FPS Limiter caps the 3D viewport to 25 FPS by default, and you can set any custom limit that suits your workflow. It works by injecting a throttle into Blender's draw loop, giving the hardware a brief rest between frames. A draw-handler routine calculates the exact time elapsed per frame and throttles only what is necessary, rather than relying on a simple timer. Capping the viewport this way reduces the load placed on the GPU and CPU during viewport navigation.

Does B- FPS Limiter save data inside .blend files?

B- FPS Limiter is built entirely on Blender's WindowManager, so it does not save any data inside your .blend project files, keeping your production assets clean. Your preferred default state and target frame rate are stored through Global Startup Preferences in Blender Preferences instead, and those settings persist across restarts. Day to day, you toggle the limiter and adjust the target FPS from the FPS Limiter tab in the 3D Viewport sidebar, so nothing about your throttle setup travels with individual project files.

Is B- FPS Limiter free to use?

B- FPS Limiter is listed as free in this catalog, and it's released under the GPL license. Pricing and licensing can change over time, so check the developer's page for the current details before downloading. The add-on is Blender Extension compatible and packaged as an add-on for Blender 4.2 through 5.1. If you have questions about terms of use or how the license applies to your project, the developer's page is the best place to confirm what currently applies.

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