There have been several studies done by educators and a literacy nonprofit. These have looked specifically at educational outcomes (for readers with dyslexia, ADHD, vision deficits, early readers, ESL/ELL students). The benefits for reading fluency and comprehension are quite large (and surprised even us, tbh).
We also gather data in our "Reading Challenge", which is more generalizable but is not a controlled experiment. This has shown that most people who take the challenge read faster with the color gradients, and that the average speed increase is 20%. But the effect is not universal.
You might try a couple of the other color schemes, including the "night mode" that inverts things. But if you read mostly in chunks, as opposed to linearly, then you're probably not as likely to benefit.
We also gather data in our "Reading Challenge", which is more generalizable but is not a controlled experiment. This has shown that most people who take the challenge read faster with the color gradients, and that the average speed increase is 20%. But the effect is not universal.
You might try a couple of the other color schemes, including the "night mode" that inverts things. But if you read mostly in chunks, as opposed to linearly, then you're probably not as likely to benefit.