below is my test code:

    @Test
    public void scan() throws  InterruptedException {

        List<Message> list = new LinkedList<>();
        for (int i = 0; i < 10; i++) {
            ReportPropertyMessage message = new ReportPropertyMessage();
            message.setMessageId(i + "");
            list.add(message);
        }

        Flux.fromIterable(list)
              .delayElements(Duration.ofMillis(20))
              .subscribe(item -> System.out.println(System.currentTimeMillis() + " " + item));

        Thread.sleep(2000L);
    }

below is a log of my code:

1718700908162 {"messageType":"REPORT_PROPERTY","messageId":"0","timestamp":1718700907945}
1718700908356 {"messageType":"REPORT_PROPERTY","messageId":"1","timestamp":1718700907945}
1718700908378 {"messageType":"REPORT_PROPERTY","messageId":"2","timestamp":1718700907945}
1718700908403 {"messageType":"REPORT_PROPERTY","messageId":"3","timestamp":1718700907945}
1718700908427 {"messageType":"REPORT_PROPERTY","messageId":"4","timestamp":1718700907945}
1718700908449 {"messageType":"REPORT_PROPERTY","messageId":"5","timestamp":1718700907945}
1718700908474 {"messageType":"REPORT_PROPERTY","messageId":"6","timestamp":1718700907945}
1718700908494 {"messageType":"REPORT_PROPERTY","messageId":"7","timestamp":1718700907945}
1718700908518 {"messageType":"REPORT_PROPERTY","messageId":"8","timestamp":1718700907945}
1718700908543 {"messageType":"REPORT_PROPERTY","messageId":"9","timestamp":1718700907945}

The result obtained is not what I want. The time difference between the subscribed data of the first row and the second row is 200ms faster. What I want is that the interval between the first row and the second row should be controlled at about 20ms.