If you wish to decrease memory usage in Chrome, first of all, you should close any tabs that you do not need anymore. Secondly, you may check your extensions and delete the ones that you use rarely. Google Chrome has an option called "Task Manager" which allows you to find out which particular tab or extension uses too much RAM. Restarting Google Chrome from time to time will also help you save some temporary resources. Being up-to-date with the latest version of Chrome is also one of the useful methods to save memory.