Computer processing speed changed after large operation (8)

I believe the answer is:

teraflop

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'computer processing speed' is the definition.
I know nothing about this answer so I can't judge whether this works.

'changed after large operation' is the wordplay.
'changed' indicates anagramming the letters.
'large' becomes 'L' (eg in clothes sizes).
'operation' becomes 'op'.
'after' anagrammed gives 'teraf'.
'teraf'+'l'+'op'='TERAFLOP'

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(Other definitions for teraflop that I've seen before include "able to work at high-speed" , "Measure of speed" , "able to calculate fast" .)

I've seen this clue in The Times.

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