As an experienced technical blogger, I can say that there are several steps you can take to make an old iMac run like new.
Firstly, you can start by uninstalling any unnecessary applications and files on your iMac to free up storage space. This can help speed up the system and prevent it from slowing down while running multiple applications.
Secondly, you can delete any cache files and temporary items that may be stored on the system. These files can take up a significant amount of space and slow down the performance of the machine.
Thirdly, you can upgrade the RAM to increase the processing power of your iMac. This will help the system run more smoothly and efficiently when running multiple applications.
Finally, updating the operating system to the latest version can also help improve the performance of the machine and provide additional features and security enhancements. For instance, upgrading to the latest version of macOS - Big Sur in this case - can lead to a better and smoother performance for your iMac.
In conclusion, taking these steps can help improve the performance of an old iMac and give it a new life, making it run like new again.