Fact · Typing and writing speed
40 to 70percent of keystrokes
In the online dataset of 168,000 typists, slow typists used almost no rollover, while most fast typists used rollover for 40 to 70 percent of their keystrokes.
Checked against its source on October 16, 2026
In the source's own words
“While slow typists use almost no rollover, the majority of fast typists use rollover for 40–70% of keypresses.”
Observations on Typing from 136 Million Keystrokes, Vivek Dhakal et al., CHI 2018, ACM Conference on Human Factors in Computing Systems, 2018, Results, Rollover Behaviour.
Open the original (DOI 10.1145/3173574.3174220)- What it measures
- Rollover is pressing the next key before the previous key is released. The paper's fast typists are those faster than 90 percent of participants, and the slow typists are the slowest 10 percent.
- What it does not show
- Self-selected volunteers typing on their own keyboards. The study shows that rollover and speed go together; it does not show that learning rollover would make someone faster.