There is a folder in widnows path that if you have a more than one server, it can use 4G resources. As shown below, your resources may be wasted by this strategy.

So here I am back on our Windows 2016 Server. And I’m going to show you how to remove this Windows side by side directory, reclaim the storage space on the server, and plug this security hole. But I do have one important safety tip before we get started. Do not, under any circumstances, simply delete that side by side directory from your hard drive. It not only contains the files needed to install new features, but it also contains the DLLs and other files needed by features that are already installed.

Just write in a Powershell this command:

Powershell> Get-WindowsFeature | Where-Object -FilterScript{$_.Installed -Eq $FALSE}|Uninstall-WindowsFeature -Remove

Don’t worry! you can install whenever you need these file. But, in installation process it will ask you where is the path of Media to Install?