I want to get better at mashing through the text in this game but I don't really know where to start or how to practice. I use two of the keys on my keyboard (the z and x key for reference) and my mouse to mash text but it usually feels slow to me when i watch world record (or most players that have a better time than me). Any tips or things that i should consider doing?

Try mapping more keys or mapping to a joystick so rotating it generates lots of inputs.

When mashing I Use WASD as mouse click and during the text conversations where you don't need to move your mouse much, like the opening dialogue sequence, I find it faster using 2 hands on WASD instead of 1 hand on my keyboard and the other clicking with my mouse.

I mapped my scroll wheel to mouse 1, limited amount of movement for max presses per second