First response time is one of the most visible support metrics, but its impact goes well beyond the initial reply.
When response times slip, customers tend to follow up. That creates additional tickets or messages that did not need to exist in the first place. Over time, this inflates volume and makes the queue harder to manage.
There is also a perception issue. A delayed response can signal disorganization, even if the issue is eventually resolved well. In SaaS environments where customers have options, that early impression carries weight.
Internally, slow response times make it harder for teams to prioritize effectively. Agents spend more time switching between conversations, and leads have less visibility into what needs attention first. This can create a cycle where the backlog grows and becomes harder to control.
Improving response times usually comes down to better intake and routing. Clear ownership, defined SLAs, and a structured first-touch process can make a noticeable difference without increasing headcount.
Zendesk publishes useful benchmarks on response times and other support metrics here: https://www.zendesk.com/blog/customer-service-metrics/