The short answer: you can learn to move through text faster, but the enormous gains promised by speed reading courses come at a cost to comprehension.
Most speed reading methods do one of three things: widen how much text you take in per glance, suppress the inner voice that pronounces words as you read, or simply skim — sampling parts of the page and inferring the rest.
The first two run into a hard limit. The eye can only resolve fine detail in a small central region, so the number of words you can genuinely take in per fixation is limited by biology rather than by training. The third is not really reading. Skimming is a legitimate and useful skill for deciding whether a document deserves your attention, but it is not the same as having read it.
Two things do reliably help. The first is vocabulary and familiarity: you read faster in a field you know well, because you spend less time resolving unfamiliar words and constructions. The second is reducing wasted movement — the re-reading, the losing of your place, the eye wandering back up a paragraph. That is the part RSVP addresses directly.
RSVP — rapid serial visual presentation — does not ask you to take in more words per glance, and it does not ask you to skip anything. Every word is shown, in order, at a single fixed point. What it removes is the travel: the jumps between words, and the chance to lose your place during them. More on how RSVP works.
It is worth being straight about the trade-off. Because the text moves rather than sitting still, RSVP makes it harder to glance back at the previous sentence, and glancing back is a real part of understanding difficult material. That is why Wordema keeps a rewind by word and by sentence, a full-text view, and a pace you control rather than one imposed on you.
Set the pace where the words register without effort rather than where they feel impressive. For most people that is faster than reading aloud and slower than skimming. Dense philosophy wants a slower setting than an adventure novel, and there is no prize for finishing early.