As I mentioned upthread (https://news.ycombinator.com/item?id=22224019 https://news.ycombinator.com/item?id=22224019) and in the other thread (https://news.ycom

As I mentioned upthread (https://news.ycombinator.com/item?id=22224019 https://news.ycombinator.com/item?id=22224019) and in the other thread (https://news.ycombinator.com/item?id=22140773 https://news.ycombinator.com/item?id=22140773), it's not that easy. And simple rules to compute parameters may lead to worse performance than the defaults. Otherwise, they would be the defaults ;)