For every worker to be able to determine whether the transaction will abort or not requires that all workers have the information necessary to make this decisio

For every worker to be able to determine whether the transaction will abort or not requires that all workers have the information necessary to make this decision available to them (so data has to be duplicated). So I'm wondering if this information is available, then is there any speed-up left available for there to be an advantage to a distributed database? Maybe there is no difference between non-distributed vs. distributed but with the slowdown from having the commit protocol.