For sometime, we have been aware that the My Scores page has been slow to load for sellers with a large amount of scores. The performance of this page has now been improved by adding server-side pagination. This means that the amount of data that is transferred to your web browser is reduced so the page will load and operate much more quickly when lots of scores are present.
At the same time, there is now a filter function for the page, which makes it much easier to find a particular score. Anything entered into the new filter field, will be used to match against the score titles refining the list of scores displayed.