Not really, they just drive the speed limit. I've been in Waymos a few times, and sure, on wide roads where people go 15mph over the speed limit, they're quite slow. But I've also seen the Waymos go faster than other cars in more narrow roads since people were going slower than the speed limit.
Realistically, the Waymos are the only cars following the law, which can make them feel slow at times.
Yes, but speed limits are also limits, not required exact speeds. On residential roads, people drive slower for a reason and Waymo probably should too!