Panacea for slow Xcode

cleanup.sh

#!/bin/sh
for f in $(ls -p ~/Library/Application\ Support/iPhone\ Simulator/| grep '/') ; do
if [ "$f" != 'User/' ]; then
echo "$f"
rm -r ~/Library/Application\ Support/iPhone\ Simulator/$f
mkdir ~/Library/Application\ Support/iPhone\ Simulator/$f
fi
done

rm -r ~/Library/Developer/Xcode/DerivedData
mkdir ~/Library/Developer/Xcode/DerivedData