Those warnings from Theme Check Plugins are not issues. Those are WordPress.org standards. Plugins Territories should not be included with Theme. But those are required by our users.
The problem is raised from low resources of your hosting/server. You should ask your host to increase the PHP Memory Limit to 250MB+ and PHP Time for Scripts to 60Sec+. If you have access to the PHP.ini file you can also do that. After changing those values you can install W3 Total Cache Plugin.