4.1.2 interface is exceptionally slow

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Running macOS Catalina 10.15.4 and Simplify 4.1.2 is running exceptionally slow. The interface lags the input by a second or more especially when enlarging the window. Everything else on this system runs snappy quick as normal.

Is there a compatibility issue with this version of macOS? Given the relationship between window size and performance could it be related to the current graphics driver?

Please help

Thanks
Chris

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Further testing shows that Simplify 4.0 runs normal speed. I'm only having the performance issue with 4.1.2.

Chris