accelerate seven (or more) substitute

Hi,

I am doing this job for each line of a 4000 lines files :

let l:lineArranged = substitute(l:lineArranged, 'foo1', 'BAR1', "")
let l:lineArranged = substitute(l:lineArranged, 'foo2', 'BAR2', "")

...
..
let l:lineArranged = substitute(l:lineArranged, 'foo7', 'BAR7', "")

I would like to accelerate the job.
How can I do ?

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