Quiz: String performance optimization

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This code takes .03 seconds to run on my computer Try running it on yours.

ns=SECONDS()

x=""

FOR i = 1 TO 30000

      x=x+"OneTwoThree"

ENDFOR

?SECONDS()-ns

?LEN(x)

Modified slightly, it takes 15 seconds. That's 500 times slower!

ns=SECONDS()

x=""

FOR i = 1 TO 30000

      x="OneTwoThree"+x

ENDFOR

?SECONDS()-ns

?LEN(x)

I

Why the difference?