السلام عليكم ورحمة الله وبركاته

The current session statistics that you see after reading a portion in Tarteel includes all sessions which have any overlap with the portion you just read. The main issue with this approach is that all the sessions are not over the same range of ayah. For example, I read Al-Furqan 1-20, and the 10 previous sessions have the following ranges 1-77, 3-20, 1-11, 12-31, 19-43, 1-20, 4-20, 11-21, 1-12, 1-20. This causes the trend graph for mistakes for page to be less meaningful. In the example above comparing the mistakes per page for the ayah range 19-43 (session 6) to the mistakes per page of 1-20 doesn’t provide meaningful insights. Similarly, if the mistakes in the session in 1-77 where mainly towards the end of the surah (after ayah 20) then the mistakes comparison is again less relevant. An alternative would be to only show sessions which include the full range that was just recited (trimming previous sessions to match). For the example in Surah Furqan, this would result in the session from 1-77 being trimmed to show the corresponding mistakes per page for ayah 1-20 and sessions which didn’t include the full 1-20 ayah would be dropped for the graph. So of the sessions previously mentioned the graph would have the following: 1-20 (the last session read), 1-20 (from the session 1-77), 1-20 (the 7th session), 1-20 (the 11th session).

This feature would be beneficial for individuals to truly see how there hifdh of distinct portions (like pages) is changing (and hopefully improving) overtime