Massive memory "leak" in QtCreator

I saw a massive memory consumption/leak in QtCreator when loading big projects (e.g. Qt Creator itself)

Steps to reproduce:

• Clone QtCreator's srcs
• Open QtCreator's .pro/.qbs or CMakeLists.txt 
• Wait until it's done parsing the project
• Check how much memory qtcreator is using (on my side is using ~800 MB)
• touch src/plugins/plugins.pro/.qbs/CMakeLists.txt file
• Wait until it's done parsing the project
• check again how much memory qtcreator is using. On my side it adds +250MB every time is reparsing the project and the cpp files.

Also closing the project (right click -> close project) s not freeing the memory.