I see folder "C:\Users\Xuyen Xich\AppData\Roaming\Tableau Prep 2018.1.1\GPUCache" , when I clean disk C.
I search all about Tableau Prep 2018.1.1 documents to read about this. But I don't see any documents related directly to GPU.
Tableau Prep 2018.1.1 use GPU improve performance, don't it?
I have moved this thread to Tableau Prep area of the forums where it will receive more attention from the Prep team. One thing you could supply to assist with this question is the data source in use. What data sources are utilized by your instance of Prep?