Xenial / Travis / Virtualized Env / Resources

Hello, when trying to switch DynamoRIO’s Travis environment to Xenial, I’ve noticed very long wait times (or hangs?) until the Travis build starts. Is there a known resource problem, bug, or anything alike that affects the virtualized environment on Travis?

e.g. https://github.com/DynamoRIO/dynamorio/pull/3471
https://github.com/DynamoRIO/dynamorio/pull/3472

Any insights appreciated.
Hendrik Greving