Now I forget Rhino 8 has very fast boolean command result , I am a new Rhino7 user , Now Do I have to buy Rhino 8 ? 
Opening times are also much shorter
Assuming you have a commercial Rhino 7 license you can upgrade it to Rhino 8 at the upgrade price. Until February 27, 2024 McNeel is offering the upgrade at a special reduced price.
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Can someone please explain the huge difference in working and result times between Rhino 7 and 8?
Is the infrastructure Rhino 7 and 8 very different?
Here’s a rundown of what’s new:
I can’t see any article showing that 8 version is faster than 7 version .
I wrote to mcneel with developer Turkey, II received a message my dragon file is complicated and incorrect but Rhino 8 updated is good now , Rhino 7 not