>I've just run this code and I found that textmerge to file is 40 times faster than string concatenation using memory variable. It is true or I miss something?
>

>#define _loops 20000
>CLEAR
>? _loops, 'loops'
>_t=SECONDS()
>xx=''
>FOR i=1 to _loops
>	xx=xx+'123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890'
>NEXT
>?'String concatenation:',SECONDS()-_t
>
>_t=SECONDS()
>SET TEXTMERGE TO memvar xx NOSHOW
>FOR i=1 to _loops
>	\\123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890
>NEXT
>SET TEXTMERGE TO
>?'Textmerge to memvar:',SECONDS()-_t
>
>
>_t=SECONDS()
>SET TEXTMERGE TO xx.txt NOSHOW
>FOR i=1 to _loops
>	\\123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890
>NEXT
>SET TEXTMERGE TO
>xx=FILETOSTR('xx.txt')
>?'Textmerge to file + FILETOSTR()',SECONDS()-_t
>ERASE xx.txt
>

True.
Cetin