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Question

High cpu usage on Lr 9.3 cloud version on Macbook Pro M4 Pro

Forum|Forum|2 months ago
April 28, 2026
3 replies
83 views

Since updating to Lr 9.3 I’ve been experiencing high cpu usage ( 95% to105%) on my Macbook Pro M4 Pro even when idle (open but not performing any tasks). I searched the forum but did not find same / similar issue. This was not the case before Lr 9.3. I always keep Lr and MacOS up to date. Any suggestions?

Here’s the system info from Lr:

Lightroom version: 9.3 arm64 [ 20260407-1929-32efcc0 ] (Apr 7 2026)
NGL Version: 1.43.0.5
WF Version: 8.3 5c9a130
VF Version: 1.0.164.1
HIL Version: 40501
CAI Version: c2pa-c/0.6.0 c2pa-rs/0.46.0
PH Version: 5.2.3
Adobe GSDK Version: 1.4.0.210
CR Version: 29.5.0.202509162212_6e7a997
Catalog ID: 1babe00f54714b8a9c8118b671521398

Operating system: macOS
OS Version: macOS 26.4.1 (25E253)
Application architecture: arm64
Computer model: Mac16,8 / Apple M4 Pro
Logical processor count: 12
Real memory available to Lightroom: 24,576.0 MB
Real memory used by Lightroom: 3,443.0 MB (14.0%)
Peak memory used by Lightroom: 4,913.0 MB
Memory cache size: 2,688.0 MB

Internal Camera Raw version: 18.3 [ 2526 ]
Maximum thread count used by Camera Raw: 7
Camera Raw SIMD optimization: Neon
Camera Raw virtual memory: 43MB / 10240MB (0%)

Display: 3024x1964
Dark Mode: No

Graphics Processor Info: Metal: Apple M4 Pro
Graphics Processor Detail: loaded: Yes, supported: Yes, compute: Yes, init: I4_GPU4, hard: success, soft: success, al: Yes, dl: No
OS Media Capability: true

ptwilli1Author

Participating Frequently

CPU usage still seems high even after installing 9.3.1. Below is a screenshot and attached is the sample process. This is with Lr open but no activity (no editing, syncing, etc).

Sample of Adobe Lightroom.txt

Sameer K

Community Manager

Thanks for sharing this log. Have you installed Lightroom from the Creative Cloud desktop app or via the Mac App Store?

Try these steps to get Lightroom to launch:

Reset Lightroom by holding the OPT + SHIFT when you launch Lightroom and select 'Yes'.
Ensure Lightroom has the required permissions on macOS: https://adobe.ly/3DyUwsz
Go to the following location to launch Lightroom via the terminal.
In Finder > Application Folder > Open Lightroom Folder > Right-click on Lightroom .app > Show Package Contents > Contents > macOS > Lightroom—double-click to open.

Share the log of what you see in the terminal window when Lightroom Launches.

Let me know how it goes.

Thanks!
Sameer K

(Type '@' and type my name to mention me when you reply)

ptwilli1Author

Participating Frequently

Hi @Sameer K ,

I installed Lightroom from the Creative Cloud desktop app and update it that way as well.

Here is the log you requested. I did not reset Lightroom yet. Did you need Lightroom to be reset before including the log?

Note: the high CPU usage has been intermittent and seems to occur when Lightroom has been open for awhile even if it’s not being used. I usually leave Lightroom open on my Macbook.

Thanks for your help!

Adobe Lightroom Output.txt

ptwilli1Author

Participating Frequently

Lr updated today to 9.3.1. I’ll watch it for a few days and see if the high CPU usage returns. Thanks!

CMass

Community Manager

Thank you for letting us know! If you see anything just respond to this post and tag both of us. :)

^CMass

CMass

Community Manager

Hey @ptwilli1

Thanks for reporting this. To help us better understand what’s happening, could you share the following?

An Activity Monitor screenshot showing which Lightroom-related process is using high CPU.
A Process Sample from Activity Monitor: select the high-CPU Lightroom process, click the gear icon, and choose “Sample Process.” Then attach the output here.

Here to help, we just need more details. :)

^CMass

ptwilli1Author

Participating Frequently

I will be away for a few days but will respond with the info when I return. It seems to happen when Lr is on for a while even if it’s not being used.

Sameer K

Community Manager

Thanks for sharing the update. Please update Lightroom to the latest version v9.3.1 and check how it goes.

Are there any images syncing? Try pausing Sync for the duration you’re editing in Lightroom.

Also, check if Assisted Culling (early access) is running in the background.

Thanks!
Sameer K

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