Optimizing queries manually is fine by me, what troubled me was more the fact that it was recommended to change a configuration setting on the fly, which sounde

Optimizing queries manually is fine by me, what troubled me was more the fact that it was recommended to change a configuration setting on the fly, which sounded like asking for problems regarding concurrent requests. But actually, I've just made a test, and it appears changing this setting only impacts the current connection, so provided it's toggled back after the request, this should not be a problem.