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Hi...i am a new user here. You can have a separate 1 Mbit/s can bus link between the two Arduinos that only carries display messages. If you are using a dedicated chip like the MCP2515 then all the buffering, encoding, decoding and acknowledgement is done for you in hardware so there is no burden on either Arduino processor.
I was also searching for the solution that how can I connect Arduino with another Arduino. Then I got help from the site which came to be of great help. You may face many problems in using it and for that, you can also visit error code 43 mac for the solution to the errors.