Many systems and monoliths that have been built a long time ago were also modular, but their modules were mostly based on the classical Three-tier Architecture. Such a setup has a low testability, because the Business layer required the Data Access Layer (DAL) to operate even in unit tests (or you had to do a code surgery to find seams, if there were ones).
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End-to-end latency averaged around 1.6 seconds, measured from my server. According to Twilio, their media edge adds roughly ~100ms on top of that, bringing total perceived latency to about 1.7s.