20 sec of black screen

i am using mxqbox M201D and M201C lakka

it take 20 sec of black screen after lakka logo and then it load the menu is that normal ?

Not usually, no. It could be a result of slow storage, though, or it could be waiting for a network location to load (assuming you have it connected to your network), etc.

i try unplug the Ethernet same thing happen and i am useing a sanDisk ultra with 80 MB/s speed