On the result page for each _recent_ build there is a link to "benchmark.txt". Unfortunately that file is deleted together with all other result files when it get's old.
http://pike.ida.liu.se/development/pikefarm/7.8.xml -> Click status light for (welcome.linkeo.intr:build 1094) => http://pike.ida.liu.se/development/pikefarm/result.xml?id=1094_261&pike=... -> Click "benchmarkj.txt" => http://pike.ida.liu.se/generated/pikefarm/7.8/1094_261/benchmark.txt
If you want to automate it without all the clicking the URL consists of
base = http://pike.ida.liu.se/generated/pikefarm/ pikever = 7.8/ buildnr = 1094_ hostnr = 261 file = /benchmark.txt
You'll still have to scrape the main page for host details and new hosts now and then though.