Thanks to everyone who replied - much appreciated.

Ok here is how it went :

1       Creating index first and loading table  :saved 1 minute overall
2       Increasing key_buffer -> 100M           :no difference
3       increasing myisam_max_sort_file_size-> 1000M and 
myisam_sort_buffer_size->100M                   :no difference

Note that the index concerned is about 80M (table about 300M )

so looks like that is as fast as it goes ( and pre-creating in index helps a 
little bit )

regards

Mark

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