[ft] Faster computation of text width?

[John Found]

According to the FreeType documentation, the fastest way to compute the width 
of some text string is to use
FT_Get_Advance function that returns the advance values without loading and 
rendering the glyphs.

But working on this task, I figured out, that using the cache sub-system and 
loading the whole images with
"FTC_ImageCache_Lookup" and using the advance from the loaded image is faster 
than the above function. 

And faster at least 5..10 times!

Is it expected behaviour or I am using FT_Get_Advance not properly?

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John Found <address@hidden>