In most medium/large organizations, trust is the biggest determinant of a team’s speed (assuming presence of competence/skill).
The trust between the executives involved determines how quickly organizational misalignments / incentive problems are resolved.
And, the trust between and within the working teams determines how quickly all the many small/daily issues that can choke execution speed are resolved.
While systems that help speed up decision making (e.g. clean escalations) can help, trust is still the biggest determinant by a distance because it has both multiplicative and compounding effects.
So, projects where there’s trust between executives and the working teams move an order of magnitude faster than projects where only one of these is present.
And, the longer the collaboration, the faster the teams execute.