I notice you're asking about a specific repack of LEGO City Undercover from FitGirl. To clarify:
Heavy Compression: The hallmark of this release is the use of the ZTool and Precomp libraries. While it saves massive amounts of bandwidth and disk space during the download, it requires significant CPU power during installation to "rehydrate" the data. LEGO City Undercover Update 1 -FitGirl Repack-
The FitGirl version is designed for users with limited storage or bandwidth: I notice you're asking about a specific repack
: Fixed general stability issues and crashes during gameplay. LEGO City Undercover Update 1 -FitGirl Repack-
Alt-Tab: Fixed a bug where the game was not visible on the system taskbar after switching windows.