Mike, Took break for federal tax return! Went to OWC and realized that I would have to have the memory upgrade cartridge mailed to me and that the installation requires opening up computer. Aborted process and will have to wait for next visit to the States to have the Apple people do the upgrade.
Meanwhile, my machine is doing better with all of the tips that I have picked up in the process.
Many thanks for your patience and advice which has been right on.