@abracadabruh1 said in Notepad++ writes a lot to disk after closing:
Resource Monitor,
Resource Monitor displays the number of bytes per second. This is unrelated to the number of bytes written. For example, if it takes you one millionth of a second to write one byte then Resource Monitor says you are writing at one million bytes per second.
Other tools such as Microsoft’s Sysinternals procmon can better show you which files an application is writing to and the number of bytes in each write. Unfortunately, procmon is not perfect as ideally what we want is a nice list of the files written to and the total bytes written.