I'm sure that's part of it, but the primary usability studies I'm aware of have all focused on speed/response. Whether this translates to "native" apps or not,

I'm sure that's part of it, but the primary usability studies I'm aware of have all focused on speed/response. Whether this translates to "native" apps or not, I'm not sure, but certainly for the web, response times are king [1]. Curiously, this metric has been a stable predictor of retention for decades (see the sources in the link as it'd be redundant for me to post them here). [1] http://ixd.prattsi.org/2015/04/response-time-is-speed-the-ultimate-usability-metric/ http://ixd.prattsi.org/2015/04/response-time-is-speed-the-ul...