Same here, when i deploy my troops during the war, everything is running on slow motion. It even hard to move the map. This is suck as hell because I need to sabotage the tc before the cannon is popping out (or at the very least barrage the damn thing). To do that it needs perfect timing and execution. Now I'm unable to do it because it's very hard to move the map. When the speed is back to normal, almost all of my foot troops is already decimated by those cannons.
I'm using Asus Zenpad 8.0 with 3 GB of RAM and 32 GB of storage capacity, with still lots of available space. The CPU and GPU is also quite good. So I don't think the problem is in my device, but it must be lies on Nexon's server.