OpenGL API method ::glFinish() went from taking a few milliseconds to several seconds causing this performance issue. It’s known that calls to ::glFinish() and ::glFlush() can cause a slight performance degradation, and these calls were only added to solve an earlier bug in the 2012 Intel drivers.
The offending API calls will be disabled in the branches above and in any future releases. However, completely removing these calls might affect users that are still running the older 2012 Intel HD Graphics driver. For this reason we have provided a system variable setting (set GSFLAGS sysvar to 8) to enable these calls for users who update to a newer version of IntelliCAD but run with very old Intel drivers.
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