Sounds like you have too many tags at once trying to be polled. You need to study the topics here about Logix optimization. Start here, read the whole thing:
As you read, open tabs for all of the related topics that are linked from it. In your other topic, you mentioned still being in development. Many of the problems can be fixed by restructuring your PLC data. You may need to do that.
While there is no magic wand, the closest thing to a magic wand for many cases is to switch to my alternate EtherNet/IP driver.
/shameless plug.