Actually, it looks like your configuration is correct.
My suggestion, then, is to increase the memory limit and execution time (as a workaround) in php.ini.
max_execution_time = 300
memory_limit = 512M
Replace the buscar_integrada.php file in the htdocs/opac folder and let me know the result.
https://abcd-community.org/download/buscar_integrada-teste-2026-07-17/#
I made a small modification for very large databases; let me know if it works.
ABCD Global