Reply to a comment from John Curtis

"DEBUG_GQF_QUERY=30

This enables a more verbose debug output when performing a query and may be helpful for troubleshooting. The debug parameter of DomQuery itself did not work for me yet."

I must say as a matter of course - please do NOT use this option if you want good performance - it is verbose.  Plus - do NOT depend upon its output in any code or even manual diagnostic practices - it is completely subject to change - it WILL change.

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