In the second game, a problem arose, and I don't know what to do about it - every time the Creature Week is announced (new creatures appear on the map), it starts to glitch badly....

It is very likely that the problem is internal - the presence of mods, maps, etc. in the game directories. I have played the map repeatedly, and recently played the latest version 1.1. Creature Weeks were announced many times, but no slowdowns occurred. Again, the statistics – already five people have completed this part and have not noticed anything similar. Indirect confirmation of my assumptions is the size of the save file - it is not that large.

although I trained with them once and killed them, but the bastards resurrected

This is a special trainer for those who want to "get stronger" - you get more experience than from a tree, two or three levels. And if you do it one more time, you can raise your hero's level by six.:)