how to reduce large assembly memory consumption in autodesk inventor

Previously im satisfied with inventor performance since i only works for about 1000 parts, but now i work for about 6000 part and it took long time for me to open and it gives me about 8 minutes to add 1 constraint.

in solidworks there as a function called speedpak that it help a lot even working for 10000 parts.

Colud anyone can gives some tips and trick about this, thanks in advanced