Lately, I have noticed extremely high disk activity for several minutes after I start Quicken. I can see this using the Task Manager. I have an SSD, so it's silent, but it does slow everything else down. I start up Quicken, add some entries, then try to login to a bank site, and the browser is almost frozen until Quicken is done doing whatever it is doing.
I think this started roughly with the R61 releases. I only seem to have noticed it over the past few weeks.