Jay, we limit the amount that is shown in the web interface to 1 MB. We recommend that you download the logs and view in a third-party editor if you need the full logs. This is by design.
On a side note, we did notice and fix an issue where scrolling the logs could be slow in the interface--even with only 1 MB of data in the textarea control. We added the spellcheck="false" attribute to the element tag and noticed an immediate performance in the scrolling.