yup. very much.
Just to help explain :
Dynamic entities :
The PC has to continuously check the entit's physical properties (it's remaining strenght, it's position, the effect of other things to it) so obviously these use up resources during run time.
Static entities :
Basically these are only used during build time. The build process uses its shape and properties to establish lighting, shadows etc. During run time, these act just like segments. So other than visual calculations, it does not use up any resources.
Try to make as many entities static as possible. Only those entities which shall be broken, used, moved by a player action should be kept dynamic.
-- game dev is fun...but taking up too much time --
