1. It is not so responsive. I tried to run another 3.5 client to connect back to my old 3.5 server, and it is very responsive…so it is unlikely a network issue. Any setting in 4.0 to optimize the connectivity for latency so that it will be more responsive?
Have you tried tweaking the display settings (menu -> display -> display settings). In version 4 the new protocol is much better at handling modern applications which are considered more “graphic-intensive” (more details about the new protocol are here: https://www.nomachine.com/AR11K00745).
In 4.1 we have implemented a new optional “lightweight mode” for thin-clients and for client and server machines with lower HW characteristics.
2. Sometimes, when I pressed ctrl+c or ctrl+x, they got translated into 10+ ‘c’ or 10+ ‘x’. I never have such problem with 3.5.
We will investigate this.