I am in hidden line an am using GDI-flicker free mode
In this case Redsdk might be quicker, try it.
You can still use Hidden line/Hidden line render in Redsdk mode.
Using large architectural drawings I don't have any problems working with my under qualified
windows 7 laptop in either mode but Redsdk is a little quicker to respond when in HL/HL render.
"What do I know, I'm still learning"..
Windows 7 64 bit HP > 2019-2018-2017, TurboCad Platinum 21,20,19 and 18.Using LightWorks, Anilab lab 5. HP all in one 23" Touch smart screen with Nvidia Geforce 210, open gl 3.3. Intel Core i5 ,2.27GHz,4 GB ram.