Since the both of Electron App and Ionic CLI environment are closed normally during two times, my memory's footprint is like this:

Because garbage collection is not happened at memory, the memory will be dried up more and more.
[Execution environment]
OS: Windows 10
Node.js: 7.3.0
Shell: Git Bash - MINGW64 which was installed since Git for Windows had installed
I don't know exactly if this issue is from the Unix Emulation Shell for Windows or not.