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[ 4:40:33.95] P:\test>cut -d, -f 1-15 data\25x500000.csv >nul

...
[ 4:42:48.34] P:\test>perl -lanF, -e "BEGIN{ $,=','} print @F[0..14];"
+ data\25x500000.csv >nul

[ 4:43:25.60] P:\test>

[ 4:53:24.51] P:\test>cut -d, -f 1-15 data\25x500000.csv >junk

[ 4:53:38.01] P:\test>