No, it's fast. There's no real difference in speed between bot builders code and EntityDistance, except it's much quicker to type entity distance!
Make sure if you do it bot's way that you don't replace xd#*xd# with xd#^2 as that does slow things down a bit (but still hardly noticable unless you are doing thousands of calculations each loop)
Make sure if you do it bot's way that you don't replace xd#*xd# with xd#^2 as that does slow things down a bit (but still hardly noticable unless you are doing thousands of calculations each loop)