Interesting observation I met using Dorico, then checked the same in Cubase and I was shocked about the result. Template in Cubase that holds 109 tracks (individual instances) of Halion Symphonic Orchestra was 20 MB big with used HSSE3, but when stored with HS7, it differs - it’s less for 5 MB.
I hope there is no bug in HS7, but I installed it only on laptop, not on main studio computer. I’m waiting for deep explanation.
Please read the post and comments in this thread in Dorico category.
HSSE3 & HS7 - difference in project length - Dorico - Steinberg Forums