Showing results for 
Show  only  | Search instead for 
Did you mean: 

EOS Webcam Utility using too much CPU


Whenever I use EOS Webcam Utility (whether it's "pro" or a previous version) and check Activity Monitor (I'm on a 2018 MacBook Pro), it says EWCService_x86_64 is using more than 100% of my CPU. Whether it's with the regular Webcam Utility Pro app, OBS, Streamlabs, etc., it is always using and incredible amount of processing power.

Is there a fix for this?


Product Expert
Product Expert

Hi cooper_ferguson,

I'm sorry to hear the EOS Webcam Utility is using so much of your CPU. There are a couple of things to check with an issue like this. The first is to open the EOS Webcam Utility, go into the settings, and select the Video tab. Since the software is using so much of your CPU try using the Preview using lower framerates option. That won't impact the quality of the stream itself, it will only impact the frame rate of the preview you see of your stream.

If that doesn't resolve the issue try lowering the video output resolution and streaming framerate to see if that frees up more of the CPU.

I've already had that setting applied when the problem became apparent. I've double checked and the problem is still there.

I'm using a Canon 80D if that information helps.


I have the same issue. EWCService is taking 100% CPU. Any other solutions available?

08/18/2023: Canon EOS R5 C training series is released.

07/31/2023: New firmware updates are available.

CR-N700 - Version 1.2.0

CR-N500 - Version 1.3.0

CR-N300 - Version 1.3.0

CR-X300 - Version 1.1.0

06/30/2023: New firmware version is available for EOS-R5 C

05/31/2023: New firmware updates are available.

EOS R6 Mark II - Version 1.1.2

EOS R6 - Version 1.8.2

EOS R7 - Version 1.3.1

05/18/2023: New firmware updates are available.

EOS Rebel T100 - Version 1.1.0

EOS Rebel T7 - Version 1.2.0

EOS 5D Mark IV - Version 1.4.0

EOS 6D Mark II - Version 1.2.0

PowerShot Elph 360HS - Version

PowerShot SX420 IS - Version

PowerShot 620 HS - Version

PowerShot SX720 HS - Version

PowerShot G1X Mark III - Version

PowerShot G7X Mark II - Version

PowerShot G9X Mark II - Version


04/20/2023: New firmware version 1.4.1 is available for EOS R3

03/30/2023: New firmware updates are available.

EOS R5 - Version 1.8.1

EOS 1DX Mark III- Version 1.7.1

Speedlite EL-1 - Version 1.0.2

03/30/2023: Product Advisory for EF50 F1.2 L USM

03/30/2023: Product Advisory for EOS R10

02/24/2023: We've updated Share Your Photos

2/07/2023: New product announcements!

EOS R8 EOS R50RF-S55-210mm F5-7.1 IS STMRF24-50mm F4.5-6.3 IS STMRF15-30mm F4.5-6.3 IS STM
01/09/2023: Help ensure your autofocus is properly aligned with a Canon Precision Alignment
01/03/2023: Welcome to CES 2023!
12/08/2022: New firmware version is available for EOS C70
12/07/2022: New firmware version 1.7.0 is available for EOS R5