I experimented with different quote servers and switched from the default server (Yahoo / Yahoo - Historical) to Google real-time and Google Historical. When using the Google quote servers to get historical prices I get different performance data from the portfolio (twice as good ), but it's obviously not correct - the yahoo server data gives me more believable portfolio performance data. There are not data retrieval errors, i.e. error log file. Is there something other than setting up the server that I am missing. My accounts are with Schwab from which I download the transactions from.
I want to use the google server since it's 10x faster than Yahoo's.