If you are getting notifications from OptimizeDevice, then your Mac is infected with adware. OptimizeDevice is adware for Mac.
OptimizeDevice changes setting in your Mac. First, OptimizeDevice installs a browser extension in your browser. Then, after OptimizeDevice 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.