Hi,
You should be able to set the width down to 180px. Make sure you’re using something like width=“200” without units, as per the HTML standard (otherwise, it should autosize to the container.)
You can disable real-time updates if you fix the number of rendered Tweets: Add the data-tweet-limit=“5” attribute to your embed code and the timeline will render fixed, without scrolling and without background updates. (Although note that the updates only occur every 30 seconds; it shouldn’t cause performance concerns.)
Ben