I play a lot of iOS games, and the loading time for KA is the longest out of all of them. Clash of Clans, Puzzles and Dragons - all load significantly faster than KA. I'm also a developer, so I understand what it takes to reduce load times. My guess is that KA is on the lowest priority for maintenance and improvements over the other games that Gree hosts.
Gree, do you have any plans to improve load time performance? Does anyone else notice the long load times and are slightly put off by them?