As stated here:
people with older AMD processors have FPS issues inside the new level 340 Hunting Grounds : Nazarene Tower.
With the upcoming christmas and new years holidays, a lot of people would want to spend time in TOS but can’t do so effectively, because the new game content is basically locked behind RNG (Challenge Mode cubes for Portal Stone Recipes) and character limitations (i.e. one entry per character per day for Challenge Mode stage 5 clear).
The only things left to do is to farm the new gear, especially in Hunting Grounds, as the drop rate of rare and unique equipment is a lot higher there.
However, people with the AMD issues can’t farm there.
That’s why I suggest the following temporary solution to give everyone a chance on good equipment while giving you time to fix the problem:
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Increase the equipment drop rates on the level 330+ fields to the same rate as the level 340 Hunting Grounds currently have until the problem is fixed or at least until the year is over so that people have a reason to spend time and money on TOS over the holidays.