From the old forums:
Solve all your DLL issues here: https://github.com/fred41/tbbmalloc_arma
(Direct Download Link: https://github.com/fred41/tbbmalloc_arma/blob/master/binary/tbbmalloc.dll )
Copy to your DLL folder in Arma, then set your startup option in the Launcher or on your Shortcut to:
-malloc=tbbmalloc -maxMem=6144
6144 being 8gb of RAM minus 2gb to keep windows happy. Adju