https://steamcommunity.com/games/505230/announcements/detail/3652908044150019722

Hope it gets here soon!

I hope that the patch will appear on GOG in the near future, according to rumors, the game's performance has really increased several times with this patch.

*короче говоря - жду с нетерпением

My copy of the game got updated today.

I don't see it yet. Did you get the update via Gog Galaxy?

Ah, so it is the newest update. The offline installers are still at 1.4

Here the changelog if you haven't seen it yet:

1. Optimization improved in many respects, most noticeably:

lowered the amount of RAM used;
lowered freeze frequency;
improved average FPS;
lowered CPU usage.

2. Headshots added!
3. Gamepad support added.
4. Game logic polished, fixed a number of smaller bugs.

The regular installer version has been updated. The game runs much more smoothly now.

You'll probably want to start a new game after installing it, however. Loading an old save with the newest update resulted in poor performance, while the same scene ran smoothly after starting a new game.

I noticed the same issue. Thanks for the tip!