We keep remote access limited to 4CIF for streaming to mobile devices. We can go higher, but there's significant lag time connecting to the cameras with higher resolution. Once connected, live viewing is smooth. During alarm events, VGA gets sent to the cloud for recording. We've found our customers would rather know their data is secure than have higher resolution. Locally they can view and playback full resolution.
We purchase this solution from DMP. DMP installs their certificates and firmware on Hikvision NVR's and cameras. Everything is programmed through their dealer site. This solution is intended for small business and residential systems. Not ready for systems requiring higher resolution.
Take a look at this demo I just recorded to show the speed of connection and image quality. You should know that the Kitchen, Liam, and Ellie cameras are all WIFI. The Safe camera is hardwired to the NVR and Driveway is going through a powerline adapter to the router and then to the NVR. I try to test the most absurd connections I can come up with at my house.