So I opened a case with Google, that is an hour of my life that I'll never get back. I shared all details, then outlined all detail again, then shared 8 different screen shots and screen recording videos of the issue.
I stated clearly this is specifically to do with Google Drive and if an external monitor is connected. They wouldn't accept this is a bug, confirmed specifically and clearly the high CPU is by design and it isn't an issue. I'm left knowing that I won't be continuing to use (and pay for) Google services, I don't really like the business model but the feature set made up for that......however this experience has left me with the clear knowledge that Google has no interest in serving customers for what I believe is a widespread issue that impacts all users with macOS 15 who use external monitors. The big thing is that most people wouldn't notice this issue........
Google refused to accept this is a bug, after I provided the correct evidence.
Google refused to provide an escalation option and just soft closed the ticket and ignored me.
Here are some direct quotes from the transcript (I was going to post some of the screenshots, but unsure if that is a good idea):
<snip> Recommended I removed files from getting sync'd (I've basically got none sync'd only streaming)
Google Drive may consume a large amount of CPU for a number of reasons, including:
Syncing folders
Google Drive may be set to mirror files, which can take up a lot of space. To change this, you can:
1. Open Google Drive for Desktop
2. Click Settings and Preferences
3. Click on your My Computer section
4. Unselect the folders you don't want to be synced
<snip> Tried to suggest it was due to an initial sync or that I was syncing too much content
"Based here, depending on your network connection and computer preferences, Google Drive may consume a large amount of CPU to complete its initial sync. If your CPU usage becomes too high, try quitting and restarting the application. You can always customize your sync experience by choosing what syncs to your computer."
<snip> tried to get me to use a different google app
"Since the issue is repeatable and non-variable, it’s worth checking if the Google Drive File Stream (instead of the full desktop app) has a better performance. Google Drive File Stream might behave differently and use less CPU in certain situations."
<snip> tried to blame Apple and get me to ask for support from "macOS"
"Since you mentioned that the issue occurs when the system is idle but only when the external monitor is connected, this suggests that the high CPU usage could be related to how macOS handles display rendering or window management with Google Drive running. Specifically, WindowServer (which handles window management and display rendering) can consume a lot of CPU when there's a heavy graphic load from an external monitor or multiple monitors."
"In that case, you need to contact the support from MacOS."
<snip> they tried to suggest this was just normal CPU
Please note that even with backup disabled, Google Drive can still use system resources, which can lead to higher CPU usage. This is because Google Drive continuously manages the connection between your local files and the cloud, monitors changes, and ensures that files are accessible and synced when needed.
"Even if you're not actively backing up or syncing files, Google Drive is still working in the background to maintain the connection and optimize the performance of file access, which can cause periodic CPU spikes. This behavior is normal and is part of how Google Drive operates to ensure seamless file management."
<snip> Told me to use Google Drive website
"In this, i suggest to use the Google Drive website because we cannot control the higher usage of the Google Drive app"
<snip> Told me no bug, that Google Drive is working as intended
That said, this behavior isn't ideal, and I can understand why you'd expect the CPU usage to drop more significantly with syncing paused. This issue has been reported by others as well, and it could be related to how Google Drive interacts with certain system configurations, particularly on macOS.
There's no bug on Google Drive for desktop
That is work as intended.
If you don't want to use the Drive for desktop you can switch to Google Drive web
I then asked for escalation several times, or other options. They just referenced that I could use Google Drive website and closed the call.