When we want to express that something happened or was done very quickly, we often use the expression "in double-quick time." However, there are plenty of synonyms that can be used to convey the same message. For example, we could say that something was done hastily, promptly, expeditiously, or swiftly. Other similar phrases include "at lightning speed," "in a flash," "in record time," "at breakneck pace," and "in no time at all." Whether you're writing a report, essay, or simply conversing with others, having a variety of synonyms to choose from can help you communicate more effectively and colorfully.