[fysiks]

You should always put new commands in a non-default plugin when possible (i.e. create a new plugin for your custom admin commands) because it will cause issues when you attempt to upgrade AMX Mod X. Also, it doesn't matter what plugin the commands are in. It doesn't matter what plugin the command is in, cmdaccess.ini will still work. It has nothing to do with number of plugins or your server's poor performance.