There are multiple ways to optimize your Linux, the most geeky way is using Terminal, there are also applications available that performs such actions like Bleachbit, Ubuntu cleaner and so on. Stacer is simple, open-source, quick and new application designed to offer you all-in-one optimizer for your Ubuntu/Linux Mint (It's alternative to CCleaner but only for Linux).
The main 'Dashboard' section displays you information about your system, real-time CPU/RAM and Disk usage, as well as Network download and Upload speed.
The main 'Dashboard' section displays you information about your system, real-time CPU/RAM and Disk usage, as well as Network download and Upload speed.