With the latest stable update 1.68, large page usage is simpler than ever before.   Basically large page mapping is possible and useful for 1. code and 2. data   for 1.(code):   use regedit to create/set DWORD value 'UseLargePages' = 1, for key [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\arma3_x64.exe]   for 2.(data)   either use BI's default allocator and simple add -hugePages to your arma start line (i think the launcher provides a checkbox for this already),   or use blub's 'xtbbmalloc.dll' for some interesting features like diagnostics, etc, the performance advantage should be the same   In any case, your (windows) useraccount must have the 'Lock pages in memory' privilege enabled (probably already done, if not use secpol.msc).