Will enabling XDebug on a production server make PHP slower?

Yes, debuggers like XDebug can slow down the performance of your PHP server. This is why the debugger is not placed in a server environment. They are deployed in different environments to avoid unnecessary overhead.

Debug messages cannot be displayed in applications that are already in production.

When debugging behavior is added to the server, the debugging engine is attached to the PHP process. It starts receiving messages to stop at the breakpoint, but this is not required behavior as it would give a performance hit to other processes, thus stopping the PHP parser.

On the other hand, when debuggers are installed, they tend to open ports in the server because they are not intended for use in a production environment.

Opening a port in your server is just as bad as opening a door for hackers to snoop around.

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