Draftsight quickly slows down and gets unresponsive for long periods

I was using draftsight 2019 without this problem. When I renewed my subscription at January I updated to 2022 sp0, it started crushing after working some time. To solve this problem I updated my graphics driver. I change gpu settings to only external graphics and also only internal graphic processor. I changed windows swap file size to 64/128/256 GB. None of them solved my problem. When I found out version 2022 sp1 is released I updated draftsight. After update Draftsight stoped crushing but works dead slow after working for some time. Sometimes it can't process a select operation with mouse or a simple move command takes more than 20 minutes. To resolve this problem I need to restart my computer periodically, which makes it really hard to work.

How can I solve this slow down problem?
Is there any place that I can find old versions of draftsight like 2021 sp3? So that I can downgrade to old version which works faster.

Thanks in advance.