TotalServerMemoryMB - 3270.125000
For the Lock page memory enable
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Lock Pages in Memory is a setting that can be set on 64-bit operating systems that essentially tell Windows not to swap out SQL Server memory to disk. By default, this setting is turned off on 64-bit systems,
Yes, that is correct, lpim is off by default but you have it turned on and you still have not told us why you enabled it.
for this reason enable LPIM in x64 operating system.
SQL service accounts can use a process to keep data in physical memory, preventing the system from paging the data to virtual memory on disk. also memory may boost performance when paging memory to disk is expected.