I learned to knit English, and recently decided to learn Continental. I feel fairly proficient at it now, so I thought I’d see if I’d actually be saving any time. For grins, I threw in combined knitting as well, since I can do that, too.
Test swatch, 40 stitches in Cream and Sugar on clingly bamboo needles. (My turbos were otherwise engaged)
Stockinette: Statistically insignificant difference. Gauge in continental is slightly looser.
2x2 ribbing: Continental is 16% faster than English. Combined was only 1% faster than regular Continental.
Seed stitch: Holy cow! Continental was 50% faster than English! Combined, however, was only 5% faster than English… probably because I had to purl through the back which feels unnatural.