To limit your RAM and CPU usage in Opera GX, you must use the built-in GX Control panel, which allows you to set strict performance caps so the browser does not slow down your gaming sessions. Accessing GX Control Open your Opera GX browser. Click the GX Control icon on the left sidebar. Look for the icon that resembles a speedometer. How to Enable the RAM Limiter
The RAM Limiter prevents the browser from exceeding a specified amount of system memory.
Toggle the Switch: Scroll down the GX Control panel until you find the RAM Limiter and flip the toggle switch to on.
Set your Limit: Use the slider to select the maximum amount of gigabytes (GB) you want the browser to use.
Enable Hard Limit: Toggle the Hard Limit option. If disabled, Opera GX will gently try to stay under the limit. Enabling it forces the browser to aggressively close or aggressively suspend background tabs to strictly stay beneath your cap. How to Enable the CPU Limiter
The CPU Limiter restricts how much processing power your browser tabs can consume.
Toggle the Switch: Locate the CPU Limiter section within the same panel and flip the switch to on.
Adjust the Percentage: Move the slider to set a firm percentage cap (e.g., 25%, 50%, or 75%) on your total processor usage. Quick Alternative: Hot Tabs Killer
If you do not want to throttle your entire browser, you can target individual resource-heavy web pages.
Look at the top of the GX Control panel for the Hot Tabs Killer section.
This tool displays a live list of your open tabs sorted by how much memory and processing power they consume.
Hover your mouse over any power-hungry tab and click the X icon to force-close it instantly. GX Control | Control your browser’s performance – Opera
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