Take into consideration that any additional operations with the database such as DB/table export or import will be included into performance log and will reduce the accuracy of assessment.
Here is a SQL command to flush log data and start data gathering once again from a blank sheet. It will require 1-2 days as stated earlier.
Before DB was optimised values were around 0,023 - 0,027.
These values can't be set similar for everyone as they strongly depend on a hardware manufacturer and performance. The best values are individual and can only be obtained experimentally.
P.S. Do not forget to update my.ini with performance_schema=off after you finish with performance review as additional logging can slightly reduce database speed.
P.S. Не забывайте выключать performance_schema=off после внесения всех необходимых правок, так как она может незначительно замедлить производительность базы.