If you are getting notifications from CacheOptimization, then your Mac is infected with adware. CacheOptimization is adware for Mac.
CacheOptimization changes setting in your Mac. First, CacheOptimization installs a browser extension in your browser. Then, after CacheOptimization hijacks your browser, it modifies settings in the browser. For example, it changes the default home page, modifies search results, and displays unwanted pop-ups in your browser.