pidInteger - Process id of the process.
workingSetSizeInteger - The amount of memory currently pinned to actual physical RAM.
peakWorkingSetSizeInteger - The maximum amount of memory that has ever been pinned to actual physical RAM. On macOS its value will always be 0.
privateBytesInteger - The amount of memory not shared by other processes, such as JS heap or HTML content.
sharedBytesInteger - The amount of memory shared between processes, typically memory consumed by the Electron code itself
Note that all statistics are reported in Kilobytes.