>>With all the small changes I made so far (restoring back calls to MySQLExec) I get 0.21 as first call and 1.77 as last call for 500 iterations.
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>The time of execution bears no relation to the memory leak imo
IMHO, if execution time gradually increases for the same call with exactly same parameters - does not it indicate a memory leak?
If it's not broken, fix it until it is.
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