Why is "Join Curves" way slower in Designer 2017 than X7?

We use the Join Curves feature a lot when taking images from CAD systems to reduce the # of objects. In Designer 2017 64-bit after some use, the Join Curves operation becomes much slower to join hundreds or thousands of objects than it did in X7. Is this a bug? Designer eventually slows down and flashes the selection about 1 time per second and takes forever. Instead of a few seconds, it now takes a few minutes or hours.

Is there any way to speed it up? I was hoping upgrading to 64-bit with multiple cores would make Join Curves faster, but it's not. Join Curves only causes 25% CPU usage. It would be nice if used all CPU cores. Disabling the flickering of selection points on and off would probably help.

The Join Curves settings are:
Bezier Curve

Gap tolerance: 0.026"

Here's a sample file:6544.des

3248 objects reduces to 547 and takes about 3 minutes in Designer 2017.

This would take only several seconds on X7.

Is there a better/faster way to reduce the objects?

Parents
No Data
Reply Children
No Data