Selenium webdriverwait function for multiple elements fails

Hello there

I want to get the timing of multiple element like below

self.tapped_button_name = self.tap_next_button()

    self.window_call = time.time()

    self.formatted_window_call = datetime.datetime.fromtimestamp(self.window_call).strftime("%Y-%m-%d %H:%M:%S:%f")[:-3]

    WebDriverWait(self.driver1, 20).until(EC.visibility_of_element_located((By.ID, 'com.ktcs.whowho:id/view_main')))

    self.view_main_time = time.time()  # Time when 'view_main' becomes visible


    element_visibility_times = {}

    for element_id, header in self.element_ids_to_headers.items():


            WebDriverWait(self.driver1, 20).until(EC.presence_of_element_located((By.ID, element_id)))

            element_visibility_times[element_id] = time.time()

        except TimeoutException:

            element_visibility_times[element_id] = None

    # Calculate time differences or mark as "N/A"

    time_differences = {

        header: round(element_visibility_times[eid] - self.view_main_time, 3)

                if element_visibility_times[eid] is not None else "N/A"

        for eid, header in self.element_ids_to_headers.items()


and here is the record for several sessions
2024-01-12 16:02:19:199,수신,2024-01-12 16:02:27:328,1.173,1.67,1.847,N/A,22.475
2024-01-12 16:04:53:480,부재,2024-01-12 16:05:02:114,1.755,1.216,1.714,N/A,23.629
2024-01-12 16:06:05:702,문자,2024-01-12 16:06:13:819,1.906,1.296,1.868,N/A,22.916
2024-01-12 16:07:59:569,수신,2024-01-12 16:08:08:157,2.277,1.19,1.616,N/A,23.113
2024-01-12 16:27:00:307,수신,2024-01-12 16:27:08:577,2.796,0.118,0.461,N/A,21.933

according to the record, only element D repeatedly time outs(it is set as 20s), but it works fine in real.
It is very strange since if element D really does not exist the result should be recoreded as N/A not the time difference, but it record the time right after timeout even when element D is already there.
any advice please?

Thank you in advance

I got the clue that the issue was due to sequential process.
I thought it would work simultaneously but timing element D was blocked by timing element C, unused at the moments.
Is there a way to time them parallelly?

Thank you