I don't have any speed issues with my Hisense A5 (no different to my Boox Nova 2), but I only use either for reading books. As a general smartphone, the A5 can't compete with my iPhone 8 - principally because of nature of e-ink screens.
The sophistication and options for refresh seem much better on Onyx than Hisense (assuming Onyx carry over the same controls from their readers to their phones). On Onyx you have a lot of control over display quality vs speed and can set defaults for each app.
As far as I know, that isn't available on Hisense and the default is a compromise (some ghosting, but fairly quick). On my Boox, for reading I prefer to use regal mode - slow, no ghosting. On the browser A2 mode - fast, ghosting. Everything else normal - a compromise.
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