You must have a bad memory , a few months ago , old 1 mb bitcoin was taking days to complete transactions due to its inability to handle the transactions load.
research the forum with all of the complaints people made, it is not hard to find.

Since it will be more profitable to mine Cash instead of old 1mb, enough miners will switch that there should be no time difference within 2 weeks or so.
Then old 1mb bitcoin problems will become even more apparent, as transaction stalling increases.
Which you can watch here: https://blockchain.info/unconfirmed-transactions


╥Aztek