@matthew probably not the answer you're looking for but let me ask a question or two. Is Apache a necessity? Have you considered Nginx? If you want to discuss the situation via PM I'm willing to do what I can to help.
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Robert @ Tech Addressed (techaddressed@fosstodon.org)'s status on Saturday, 14-Oct-2023 15:16:50 JST Robert @ Tech Addressed -
Robert @ Tech Addressed (techaddressed@fosstodon.org)'s status on Saturday, 14-Oct-2023 15:16:49 JST Robert @ Tech Addressed @matthew my thought was that perhaps Nginx would have a better chance of responding when the other processes are being hogs. I have no experience w/ optipng so I don't have any advice there.