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Bigger blocks take more time to process if they are stuffed with transactions that take a long time for a node to process because of quadratic hashing problems. A miner could make blocks like this and then also delay the release of the block to gain an advantage finding the next block. Also add in the whole asicboost advantage and the GFC lag and it would be a nice attack for the Chinese miners. It seems like this is why they want big blocks and no segwit.

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Well first of all, segwit doesnt affect the quadratic hashing attack vector because legacy non-segwit transactions are still valid even with segwit activated, so the attacker would just use non-segwit transactions for his attack. Flextrans (a bitcoin classic proposal) on the other hand could actually solve quadratic hashing.

Secondly, the Chinese miners overwhelmingly support segwit2x, including the 2mb HF that comes with it. If they are trying to keep asicboost (which has not been proven to actually being used), why would they support segwit2x instead of trying to force BU instead? Segwit2x includes....you guessed it....segwit...which disables covert asicboost.

We still have to wait and see if segwit2x actually happens. I guess we don't have much longer to wait.

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