Sometime is track in my php log that execution of geopip.inc takes longer than 30 seconds. It is not all the time.
The exact error:
21:03:44 PHP Fatal error: Maximum execution time of 30 seconds exceeded in D:\Webserver\stats.mvanlaar.net\htdocs\plugins\GeoIP\libs\geoip.inc on line 317
For the GeoLiteCity database, this line in geoip.inc is fread()'ing a 42 MB data file.
Please increase max_execution_time in php.ini. (Default is 30 seconds.)
You probably won't need to increase the delay for Apache or IIS. (Both default to a timeout of 300 seconds.)
or, as suggested in the geoip ticket, install the apache geoip module, for higher performance.