I just tried the SVN from Saturday, and that has improved things to some extent..
Channel changes are still slow, but a little bit faster now.
If changing between two AC3 or non AC3 stations (where the graph doesn't need to be rebuilt) the change time is around 7 seconds.
If changing from AC3 to non AC3 stations the time is around 12 seconds.
With this new version I don't see the repeated wait for tuner lock, but there are still some long delays in there between various steps.
Channel changes are still slow, but a little bit faster now.
If changing between two AC3 or non AC3 stations (where the graph doesn't need to be rebuilt) the change time is around 7 seconds.
If changing from AC3 to non AC3 stations the time is around 12 seconds.
With this new version I don't see the repeated wait for tuner lock, but there are still some long delays in there between various steps.