depending on the size of the Archicad projects you have open (you've got 4), it will affect the computer's performance, seeing as you're using 98% of your memory. this might be a hardware limitation at your end.
perhaps closing down a few of those AC projects? or reducing the file size of those projects you have open? you can reduce the file size by reducing your project's loaded library for a start. using libraries that do not have thousands / millions of polygons per object.
AC25 | Win10 | 64 bit | 16Gb RAM |Intel i7 8700 @ 3.20Ghz
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