To me it looks mp3 files (or other multimedia file types) reduce the performance of work pages remarkably; the more mp3 files the worse! A really bad example is the work page page for Orgelbüchlein (http://imslp.org/wiki/Das_Orgel-B
üchlein,_BWV_599-644_(Bach,_Johann_Sebastian)) by J. S. Bach.
While the page is building I see on the status line of my browser repeated references to an apparently external service, 'longtailvideo'. My impression is that the repeated references to that service is the main cause of the poor performance.
Can something be done to improve performance of such pages?