Sorry, switched channels and it works okay now, for the most part, with just an occasional bit of lag. However, this new channel was one that was causing the same kind of laggy performance previously with the same equipment. On the other hand, no problem at all on a third channel with my MBP. When it works, performance is quite snappy and satisfactory. On a related subject, I periodically have connection problems and lag with a wireless Apple keyboard and the desktop computer. Not sure what is going on with these intermittent problems. Don't think anything is changing in my system. Interference from outside perhaps?