I just installed a fresh copy of latest XAMPP and started Apache and MySQL. Checked the task manager and by default empty MySQL with no databases running eats up over 400MB of ram out of nowhere while not in use ...
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When you first install and run XAMPP you will notice the MySQL service can instantly takes up about 400mb, this is a huge amount of RAM. This issue can easily be fixed.

moseskurniawan.com/blog/xampp-1-8-3-2-mysql-5-6-14-high-memo...
I recently installed xampp 1.8.3-2. But there is a quirk, the mysql service is using high memory usage (400MB above). There is no active queries. Rhis is how to fix it.

stackoverflow.com/questions/23722697/xampps-mysql-uses-over-...
I just installed a fresh copy of latest XAMPP and started Apache and MySQL. Checked the task manager and by default empty MySQL with no databases running eats up over 400MB of ram out of nowhere while not in use ...