Thanks for your reply.
My performance issue comparing php 7.1.9 and php 7.1.11 had an explanation as php_xdebug was disabled by default in php 7.1.9 due to a bad linkage to a non-existent file.
The zend_ext directory contained the 7.1 dll but the link pointed to a version 7.0 dll
zend_extension ="C:/wamp2/bin/php/php7.1.9/zend_ext/php_xdebug-2.5.5-7.0-vc14-x86_64.dll"
php ve
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