I believe that there are at least 4 good improvements in Rhino 7 that will make your upgrade from Rhino 5 worthwhile:
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The viewport in Rhino 7 is about 3 to 6 times faster than the one in Rhino 5.
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Shadow effects are on a whole new level, as we discussed in another topic recently. This particular enhancement enables custom real-time shadows based on ambient occlusion, so the close by objects actually look 3d and easy to distinguish from each other in Rhino 7, unlike Rhino 5 where they appear flat.
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It’s possible to adjust the line thickness in Rhino 7 through a hidden command called
testWireThicknessScale. This is extremely important if you work with screenshot drawings or simply want to customize the line thickness inside the viewport precisely.
I set it at a value of 1,5 while working on a 4K resolution, but you can choose any different number depending of your liking. The good part is that you can set even very specific decimal values such like 1,73 or 4,08 (not that somebody is going to use such weird values, but the possibility is there).
I made the following setting to load the custom line thickness upon every start of Rhino:
“testWireThicknessScale Enabled=On Scale=1.5 Enter”
- Rhino 7 has a much better support for Scaling resolution in Windows 10 and 11. For example, I use 200% scaling, because I want my Windows 10 icons and programs to look as big as if they are rendered on a FullHD screen, despite that I use a 4K resolution for better clarity.
P.S. Keep in mind that Rhino 7 ships with a newer 3d mouse plug-in which no longer supports older 3d mice such like 3d connexion SpacePilot etc. However, I can still use the latter thanks to a “hack”: I simply replace the original plug-in with the one that came in Rhino 6.3. 
The downside is that I’m forced to repeat that after every update of Rhino 7. Other than that inconvenience, the 3d mouse works flawlessly. It would be nice if the Rhino developers include the plug-in from Rhino 6.3 along the newer one and add an option to choose the older one as an alternative to use legacy devices with discontinued support from “3d connexion” (it’s a very sad planned obsolescence that they do on purpose, in order to force people buy their latest 3d mice).
My SpacePilot works best with the 3DxWare 10.3.0 driver. It’s possible that other discontinued devices may work better with some different driver version.