When your Mac's RAM runs out, MacOS will start storing data on the main unit and exchanging it between it and the RAM as needed. This is known as virtual memory. If your Mac's drive is already overloaded, then it will send a problem message with the application's memory. To avoid this issue, it's best to check and free up disk space; for example, use Macube Cleaner to clean your Mac by removing junk files, uninstalling applications and managing extensions.
If you don't have enough space on your boot drive for an application to store temporary files, you'll see an error message stating that the system has run out of memory for applications. Some apps take up several gigabytes of space on your Mac, so if you don't use them, it makes sense to uninstall them. If they were downloaded from the App Store, you can always download them again when you need them. Or, if not, you should be able to download them again from the developer's website.
When a “memory out of memory” error appears, the first thing to do is close the applications in use. Usually, an application will appear as “paused” and highlighted in red, so you should start with these options. Restarting your Mac is probably the easiest way to free up space on your Mac. CleanMyMac X is an Apple-certified Mac cleaner that helps you tidy up, optimize and protect your Mac.
As a professional Mac cleaner, Macube Cleaner offers easy-to-use solutions for optimizing your Mac's memory. Most Macs come with 8 GB of RAM or more; it's been a long time since Apple shipped Macs with 4 GB of RAM or less. To prevent this issue from happening again, it's a good idea to keep a portion of the hard drive free. 10% is a good rule of thumb. Additionally, Parallels created Toolbox, a collection of useful tools that make it easy to do various things you might want to do on a Mac.
This can help simplify processes and prevent memory issues.