So I was for once in a long time again busy with web development, trying out the new PHP 7 in combination with xampp. Being frustrated by the slow page servings on my decent hardware equipped localhost, I went out to find the bottleneck.
As it turned out it was the the PHP debugger that slowed the process down by a lot. In old xampp packages this was known as the 'zend_xdebug' extension. However it changed with PHP 7.
To fix it, simply open up your 'php.ini' file, and mark out the following line
Disabling the debugger did the trick for me, although I'll miss the fancy reports now...