I would make sure your MySQL database has proper indexes setup. Not having proper MySQL indexes setup can slow your code down a ton!
But if it is your PHP code that is causing the issue, you should post that as appose to the Java side. Since the PHP Code deals with the database, my bet is that is where the hold up is.
The problem is that URLConnection is actually pretty slow. You could try passing the Proxy.NO_PROXY parameter to the openConnection, but it won't make it superfast. (1 to 3 seconds per call, so you're still using up a lot of time)
An alternative to the HttpConnection could be the Jakarta Commons HttpClient.
It's actually also quite funny that the url's to update your level are left open: if someone finds out about that, you're going to have a whole lot of cheaters using your game.
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About the technologies asked in this question
PHP
PHP (from the English Hypertext Preprocessor - hypertext preprocessor) is a scripting programming language for developing web applications. Supported by most hosting providers, it is one of the most popular tools for creating dynamic websites.
The PHP scripting language has gained wide popularity due to its processing speed, simplicity, cross-platform, functionality and distribution of source codes under its own license. https://www.php.net/
MySQL
DBMS is a database management system. It is designed to change, search, add and delete information in the database. There are many DBMSs designed for similar purposes with different features. One of the most popular is MySQL.
It is a software tool designed to work with relational SQL databases. It is easy to learn even for site owners who are not professional programmers or administrators. MySQL DBMS also allows you to export and import data, which is convenient when moving large amounts of information. https://www.mysql.com/
HTML
HTML (English "hyper text markup language" - hypertext markup language) is a special markup language that is used to create sites on the Internet.
Browsers understand html perfectly and can interpret it in an understandable way. In general, any page on the site is html-code, which the browser translates into a user-friendly form. By the way, the code of any page is available to everyone. https://www.w3.org/html/
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