For example, please take a look at the attached file: you will see these comments in red: “Using temporary; Using filesort”. Temporary tables and filesort are known to be performance killers (especially on large datasets). If you can get rid of them, you will get a faster query. The next (by importance) is the orange label — ”range”. It means that MySQL has to do several lookups in the index to get all necessary rows. range is OK unless you have a large “x IN (List)” condition or when more than 30% of the rows match the range condition (if you have a large dataset).

To summarize: the plugin just simplifies the analysis of the queries but it is the user who has to make the final decision.

PS — if you need help with the query optimization, feel free to ask

query.png