Again, for the record, with the speed limit restriction lifted -- that's not the reason for the slowdown. The current Horizon equipment, which requires doors to be manually opened and closed, could be causing a slowdown.
Non-tilting equipment, with trainlined automatic doors, should be able to keep the same schedule as the Talgos.
But you're right, a 3:30 run time is PAINFUL when you consider that with no traffic, the BoltBus can make the trip in about 2:45.
The predictable 3:10 that was supposedly possible with the Point Defiance Bypass is better -- but frankly, WSDOT and Amtrak still need to work to tighten that up more. Station stops need to be shorter.
This gets me to an important, unmentioned point, the Talgo Series VI trains lacked fully trainlined automatic doors. Conductors could not stand at one control panel and open/close doors on one side of the trainset. That was the reason given for need to have the quirky assigned seating system. It was also a problem that Talgo was unable or unwilling to fix.