to_sql is too slow
#### Code Sample, 

```python
df_name.to_sql('table_name',
                          schema = 'public',
                          con = engine,
                          index = False,
                          if_exists = 'replace')

```
#### Problem description

Im writing a 500,000 row dataframe to a postgres AWS database and it takes a very, very long time to push the data through. 

It is a fairly large SQL server and my internet connection is excellent so I've ruled those out as contributing to the problem. 

In comparison, csv2sql or using cat and piping into psql on the command line is much quicker. 
