As of today, the Power Query Editor window, on MS Excel 2013, has been very slow to open, even on a blank workbook with no data, no queries written. Upwards of three minutes just to show an empty editor window. I have tried
Uninstall and install the latest version of PQ (2.62.5222.701 32-bit)
Repair MS Office
Stop MS Teams running as a new version installed
Checked Anti-virus - could not see anything that would impede performance
Running a refresh on a simple query that has previously taken less than 30 seconds, now takes upwards of 10 minutes. No errors are shown and the results are all OK.