I've noticed since upgrading to Subsonic 6.0 that there is often quite a bit of lag before songs start to play when playing remotely in a browser. I did not notice with previous versions. I am accessing my server remotely. It has a 5Mb/s upload speed, which isn't that fast, but was more that adequate before. It feels to me like the new HTML5 player is downloading the entire song before it starts to play rather than starting to play after a few seconds have buffered.
Has anyone else had this issue?