Have you checked it on the standard, namely 140 protocol? The interface was not bought as a pack. Initially, I took a clean patch from Eternity, when this protocol was just being sold. I gradually added different mods to it. Some were bought from Projack (this year, but the problem existed before that)
Initially, the basic changes were made by a person from this forum, I forgot his nickname, since I have only been communicating with him in TG since 2022, but he is a person with a reputation and worked on large projects. There are minimal mods in the interface: the number of shortcut panels + an additional panel. Search in the inventory, activation of the synthesis button in the inventory and that's all, I think.
Why I returned to this question again, because I saw that recently on the same assembly another person opened, but he did not have my interface, but his own. And there were comments from players with exactly the same problem - a drop in fps after 3-6 hours. I initially indicated 2 hours, but this is not enough. You need to farm for 3 hours and preferably a lot of wigs.