# CPU-Usage is low in Step 1

**URL:** <https://community.pix4d.com/t/cpu-usage-is-low-in-step-1/18677>\
**Category:** PIX4Dmapper Questions/Troubleshooting\
**Created:** [June 24, 2021, 10:30am UTC](https://community.pix4d.com/t/cpu-usage-is-low-in-step-1/18677 "2021-06-24T10:30:02Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Saltcity](https://sea2.discourse-cdn.com/pix4d/user_avatar/community.pix4d.com/saltcity/32/4184_2.png) [@Saltcity](https://community.pix4d.com/u/Saltcity)\
**Post date:** [June 24, 2021, 10:30am UTC](https://community.pix4d.com/t/cpu-usage-is-low-in-step-1/18677/1 "2021-06-24T10:30:02Z")

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Hello,

i have a question to CPU-Usage in the Step 1 (calibration):

In some substeps the CPU ist running between 3 and 75 % with all cores, always going up and down. In some substeps only with 3 % and 1 or 2 cores! But never with 100 % and a constant power. The CPU ist a Threadripper 3960 with 24 cores.

The GPU (Quadro P2200) ist running with max. 12 %, i have already changed the nvidia setting to 3D GAME DEV in the settings and get the newest driver.

I have a fast SSD and 128 GB RAM - so were could be the bottleneck?

And does somebody has informations about the substeps of Step 1? I didn’t get the logic of “optimizing”, “optimizing with geoinformation” and so on.

I don’t understand why Pix4D is not running on 100% CPU-Power.

Any suggestions? Thanks!

 ![20210624_112534](https://global.discourse-cdn.com/pix4d/original/2X/3/3ade4f682fdafb3ed90264ea39f949ab40b153f4.jpeg)  
 ![20210624_113013](https://global.discourse-cdn.com/pix4d/original/2X/d/d36a5a212a1e947751c3e983e58596b9433214d5.jpeg)

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<div class="post-metadata">

**Author:** ![Saltcity](https://sea2.discourse-cdn.com/pix4d/user_avatar/community.pix4d.com/saltcity/32/4184_2.png) [@Saltcity](https://community.pix4d.com/u/Saltcity)\
**Post date:** [June 25, 2021, 12:47pm UTC](https://community.pix4d.com/t/cpu-usage-is-low-in-step-1/18677/2 "2021-06-25T12:47:27Z")

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Ok, we got the “problem” solved.

When deactivating the GPU in the Pix4D-settings the processors are running in full speed. So the Quadro-GPU is the bottleneck in our system.

Maybe this Information is useful for somebody…

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**Author:** ![Daniele\_Lecci](https://sea2.discourse-cdn.com/pix4d/user_avatar/community.pix4d.com/daniele_lecci/32/9493_2.png) [@Daniele\_Lecci](https://community.pix4d.com/u/Daniele_Lecci)\
**Post date:** [June 28, 2021, 9:40am UTC](https://community.pix4d.com/t/cpu-usage-is-low-in-step-1/18677/3 "2021-06-28T09:40:24Z")

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Hi,

Thank you for your feedback.

It is expected that the CPU is not running at 100% (in step 1) if a GPU is selected.  
Are you also experiencing differences in processing time?  
In many cases, the GPU can help speed up the processing, but all systems are different.

I hope other users could find this information helpful. ✅

More information about PIX4Dmapper and GPU can be found here:

> **[Use of the GPU in PIX4Dmapper](https://support.pix4d.com/hc/en-us/articles/203405619-Use-of-the-GPU-in-Pix4Dmapper)**
>
>  
> 
> Information: 
> 
> 
> For more information about Hardware Components usage when processing with PIX4Dmapper: Hardware components usage when processing with PIX4Dmapper.
> For more information regarding:...

Cheers