Draftsight 2020 very slow operation

Hi, I am new here, but used Draftsight 2018 since a while. It worked perfectly but my free licence ended so I installed Draftsight 2020 trial version. I am intend to purchase it but this one works very slow comparing to 2018 version.
If I select a bigger group of elements it takes about 5 seconds to select, and moving them to another position takes about 15-20 seconds... Several other feature also very slow, eg. moving items to another layer, etc...
Do you have any advice?