Increased GOGC from 800 to 1000 according @kostya-sh suggestion at https://github.com/TechEmpower/FrameworkBenchmarks/pull/1969#issuecomment-196692908

toolset/setup/linux/languages/go.sh

@@ -14,6 +14,6 @@ fw_untar go$VERSION.linux-amd64.tar.gz
 echo "export GOROOT=${IROOT}/go" > $IROOT/go.installed
 echo -e "export GOPATH=\$TROOT" >> $IROOT/go.installed
 echo -e "export PATH=\$GOROOT/bin:\$PATH" >> $IROOT/go.installed
-echo "export GOGC=800" >> $IROOT/go.installed
+echo "export GOGC=1000" >> $IROOT/go.installed
 
 source $IROOT/go.installed