Your Moodle seems to have some difficulties.
The harddrive seems too slow.
- Check the harddrive and/or the temporary folder state
- Change your harddrive or the temporary folder
The database seems too slow.
The login page is too slow to load.
- Purge the Moodle cache
Server : windows 2016, MSSQL 2016, IIS 10,
Processor: Xeon CPU 2.10Ghz(5 Processors)