Just switched from Android (where this keyboard worked just great for me for last couple of years) to iOS and have an impression that it doesn't speed up my typing at all here...
Can you please remove accented characters that are not supported/does not appear in the selected language? I'm using Polish as my main language and when trying to input "Ą" I have to scroll all the way through À, Á, Â, Ä and couple more that my language doesn't use to reach my native letter at the end (can't make a screenshot with this long-pressed pop-up appearing on screen). The same situation happens with other accented characters of Polish language (Ę, Ł, Ó, etc). That was not an issue on Android.