This summary is not the rule. The rule text controls.
Your lawyer is supposed to work on your case steadily and without unnecessary delay. This means they should follow through on tasks, meet deadlines, and keep your case moving forward instead of letting it sit untouched.
Lawyers often handle many cases at once, but that doesn't excuse dragging their feet on yours. If a lawyer keeps putting off your case, misses filing deadlines, or takes so long that it hurts your chances of a good outcome, they are not living up to this responsibility. Even if a lawyer never intends to hurt a client, being slow or careless with a case can cause real harm, like losing evidence, missing a court date, or running out the clock on important legal rights.
This rule exists because clients depend on their lawyers to take action when it matters. A lawyer who feels genuine concern for a client will push the case forward and keep it moving, even when the work feels tedious or the case has no clear deadline. Simply put, your lawyer should treat your legal matter with the urgency it deserves.