The really important advice boils down to the simple things. Like not using the default String type for heavy text processing since it is a [Char]. In any language a string represented as a linked list is going to be slow. It is still useful, just slow. But use Data.Text instead and you'll likely see a massive performance gain due to the use of proper data structures and algorithms (when processing a lot of text).
Having a solid grasp of the fundamentals gets you quite far.
Having a solid grasp of the fundamentals gets you quite far.