Edit: sorry to repeat most of what
@coney27 said .. I started typing this at work earlier this AM but got tied up before I could hit the post button.
i'll relate this cars, i've had about 27 vehicles and not once have i read the entire owners manual before turning the key and driving
Unless you were a brick, you also had over a decade of observing how vehicles functioned
before you bought your first one, much less got behind the wheel for the first time.
I'm hoping your experience with vehicles has been a bit more smooth than your experience to-date with pro-grade IP Cameras, so this is probably not the best analogy to use.
tried gDMSS lite, it's pretty fast, the full version now free takes about 30 seconds to pull up a camera.
The only time I've had the DMSS smartphone app take that long to connect is when it was setup to use P2P to connect to a camera instead of directly connecting to a camera's 192.168.x.x IP address. The P2P solution will allow you to view your cameras when you're not connected to your home WiFi network, but every time you connect it goes through a process where Dahua's servers on the Internet have to broker a connection back to your cameras so it can ride through a firewall without having to setup a VPN (recommended) or port forwarding (risky). Configuring DMSS to connect directly to your cameras' 192.168.x.x IP address should connect almost instantaneously (as
@looney2ns noted), but it's not going to work when you're away from your home network unless you setup a VPN.
i have many spoons in many soups here.
Chefs that know the ingredients that they're cooking with (i.e. IP camera fundamentals) and also know their kitchen well (i.e. networking, firewall, etc fundamentals) can pull off cooking many soups at the same time. Folks cooking with ingredients that they haven't used before in a kitchen they're unfamiliar with aren't as likely to pull that off successfully.
There's a lot to learn. The type of camera system you're trying to build is normally designed and installed by folks that have training in this matter and have made professional surveillance their career (or at least their job). Most folks here have learned this technology as they went, doing one camera at a time and saving harder aspects (like LPR) until later in the project. The way you're approaching this is pretty unique.