The filter and softener each will have losses depending on how much flow you're trying to push through them. So, yes.

And placing a section of 3/4" line in the middle of a 1" line will also reduce the pressure, especially since you'll probably have a lot of fittings to get into/out of your filter.

You'd get the least pressure loss by piping up to your filter with 1" and then reduce to 3/4" at each connection.