Speedup

Speedup is a metric that quantifies the typing efficiency gains achieved by magic keys in a keyboard layout. It measures the percentage reduction in total keystrokes when magic key optimizations are applied compared to typing normally without magic.

Note

Speedup is only calculated on layouts where a magic key may produce multiple keystrokes when pressed. Traditional layouts without magic functionality will not have a speedup value.

Speedup is calculated by comparing the total unigram counts from the original corpus against the effective unigram counts after magic key optimizations:

$\text{Speedup}\% = 1 - \frac{\text{Adjusted Unigrams}}{\text{Original Unigrams}}$

Where:

• Original Unigrams: Total character count in the text corpus without any magic optimizations
• Adjusted Unigrams: Total effective character count after magic key expansions and optimizations are applied