Hi Robert,
not very helpful for you I know, but I use the Lenovo M10 (no plus) and the performance is absolutely normal - the latency, the reaction is normally. Again, I can´t really help but I´m not sure, if this is a app issue - possible something is running in the background or similar else.
I don´t have any performance issues on my Lenovo M10 … sorry …
Cheers,
Richard