Fix

src/maxwell/maxwell_solver.cpp

@@ -246,8 +246,7 @@ void solver_mainloop(const model& mod, State& state, maxwell::parameter_loader&
         timestep(mod, state, mpl, ti);
         do_sources(mod, state, mpl);
         swap(state, mpl);
-        
-        cudaDeviceSynchronize(); 
+
         double time = tc.toc();
         total_iteration_time += time;