Expert php or java: need to optimise script for speed

We are looking for a expert php or java programmer to optimise a php script or writing a new program. The php script generates reports and graphs from textfiles. However this script is to slow. The textfiles contain measurements; one measurement per line. The script needs to generate the reports faster (it takes around 90 seconds) for 100.000 lines. The script also generates 3 graphs in PNG using jpgraph. Making the PNG's graphs takes around 65 seconds. Script execution is commandline. However this can be changed to have a webinterface.