I've made some small adjustments:
- keep myself out the list of referers (in index.html just change the if-statement to exclude the references from your own site)
- changed the query for referers (/admin/blocks/referers.php) in two ways. First added an 'order by rid' so the rows get displayed in the right order, and changed the select for the number of rows, the 'select *' changed in 'select rid' so this query is index-covered and faster.
- keep myself out the ip-tracking list (/includes/counter.php) so this list not polluted. I managed this by simply excluding all local ip-addresses.