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No, because ping response delay is not much of a function of distance. It is much more strongly a function of the number of hops (routers and switches) between the two machines than physical distance …

The pullup resistors can be anywhere on each net, and your main issue can be routing simplicity. The only thing to watch out for is capacitive coupling if you've got other nets with high dV/dt. …

No, I don't believe the Eagle autorouter can do that. You can set a trace thickness in the net class, but I don't know of any way to have the autorouter realize that thickness by using several thinne …

It doesn't matter what units packages are defined in because any decent software decouples package definitions from layout and routing dimensions anyway. … For layout and routing, use whatever you are comfortable with. I learned this stuff thinking in inches and mils, so that's what I use. …

My normal workflow in routing a board with Eagle actually starts with giving thought and attention to placement. … Look at the airwires carefully when placing parts, and think about routing at that time. Then when it's time to start routing, I start by doing the few critical areas manually. …

To do this, make the cost of routing within a polygon high and the via cost low. … Before auto-routing, route the critical traces manually, and connect any grounds you can right at the pad to the ground layer. That will cause it not to waste routing space connecting the grounds. …

That leaves maximum room on the top layer for routing everything else. … Do basic housekeeping pre-auto routing. This includes connecting all the ground pins directly to the ground plane for example. …

Smells like a data-dependent problem. You may have some unfortunate coupling between some of the data and/or address lines such that the right pattern causes a failure somewhere. Try slowing down …

There is no need to agonize of power routing if the power supply is locally bypassed to the ground plane at each place it is used. …

Yes, this is done in the DRC settings. One of the parameters sets how far traces must be from board edges, which includes the edges of unconnected holes. I don't remember the exact setting name, but …

Their connections are already on the same plane as the micro's pins, so they simplify routing by not taking space in other layers. …

Yes, most likely that's fine. You have to make sure each chip is set up to expect a ready clock in, not to drive the crystal itself. You have to look at the datasheets, of course, but most likely th …