Engagement velocity is the rate at which an account engages with your communications relative to its established baseline. A customer who used to open CSM emails within 24 hours and reply within 48. and now takes 5+ days to open and stops replying, has had their engagement velocity drop. The pattern is the strongest forward indicator of churn risk in B2B SaaS, typically preceding explicit churn signals by 4-8 weeks.
The same pattern applies to active deals. A prospect who was opening sales emails within hours during active evaluation, then suddenly takes a week to respond, has had their engagement velocity drop. This often precedes deal-stalling by 7-14 days. Catching the velocity change in time to investigate or pattern-interrupt is meaningfully more effective than reacting once the stalling is explicit.