Strange, I (non-native speaker) can't anymore, while having had no problem with spritz at 500wpm. But otoh their text is much easier to comprehend. Still, with

Strange, I (non-native speaker) can't anymore, while having had no problem with spritz at 500wpm. But otoh their text is much easier to comprehend. Still, with the marked letter it just felt easier. I'm guessing the one marked letter in the same position keep my eyes focused on that point, making the reading less stressful.